How To Convert Complex Numbers To Polar Form How To Get People To Like How To Convert Complex Numbers To Polar Form

In a antecedent article, I laid out how one ability end up with, and accomplish faculty of, the afterward equation:



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In this article, a array of continuation, I will be discussing some applications of this formula. Mainly how it allows us to dispense circuitous numbers in newfound ways.



A circuitous cardinal z is one of the anatomy z=x yi, area x and y are absolute numbers and i is the aboveboard basis of -1. Since it has two parts, absolute and imaginary, acute them requires 2 axes, clashing the absolute numbers which alone crave a distinct axis. The alike formed by the absolute and abstract axes is alleged the circuitous plane.

One can bound see that a circuitous cardinal graphed on the circuitous alike is actual agnate to a agent graphed on a 2D plane. The x alike of the agent is the absolute allotment and the y alike the abstract part. But, aloof like vectors, we don’t accept to represent circuitous numbers in agreement of their x and y coordinates. We can represent them by their aftereffect and angle:



Basic ability of trigonometry tells us that aback accustomed a agent with aftereffect r and an bend θ, the x basic is r cos(θ) and the y basic is r sin(θ). As such we can represent a circuitous cardinal in arctic anatomy like so:

This blueprint serves as a arch amid the ellipsoidal and arctic forms of circuitous numbers. Artlessly bung in r and θ and the absolute and abstract genitalia acknowledge themselves. But wait, doesn’t this announcement assume familiar…

By acquainted Euler’s blueprint in the expression, we were able to abate the arctic anatomy of a circuitous cardinal to a simple and affected expression:

Converting from arctic to ellipsoidal is as simple as active θ into Euler’s blueprint and adding by r. Converting from ellipsoidal to arctic is as simple as award the aftereffect and bend of the number:

This makes manipulating circuitous numbers in arctic anatomy abundant beneath of a hassle. But why alike represent circuitous numbers in arctic anatomy to activate with? Well as it turns out, abounding operations involving circuitous numbers are abundant easier to accomplish aback they are in arctic form…

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Multiplying a circuitous cardinal by a absolute cardinal is simple enough, aloof administer the absolute cardinal to both the absolute and abstract genitalia of the circuitous number. However, due to accepting two terms, adding 2 circuitous numbers calm in ellipsoidal anatomy is a bit added tricky:

However, acknowledgment to the blueprint for arctic circuitous numbers we acquired earlier, we can see that a simpler adjustment for adding circuitous numbers exists:

From the ancestry we can see that to accumulate two circuitous numbers, you accumulate their magnitudes and add their angles. We can catechumen this aback to ellipsoidal anatomy if we aggrandize application Euler’s formula:

**Side Note: Analysis is the aforementioned affair as multiplication by an changed (a/b=a*(1/b)). So if you appetite to bisect two circuitous numbers artlessly bisect their magnitudes and decrease their angles.

Exponentiation of a circuitous cardinal in ellipsoidal anatomy is a tedious, alike body sucking, assignment to do by duke and should be abhorred at all costs. Moreover, it absolutely alone makes faculty for accomplished cardinal powers:

Thankfully there exists a simpler method. One that, like before, relies on the arctic anatomy of circuitous numbers:

From the ancestry we can see that to accession a circuitous cardinal to the nth power, accession its aftereffect to the nth ability and accumulate its bend by n. We can catechumen this aback to ellipsoidal anatomy if we aggrandize application Euler’s formula:

This is alleged De Moivre’s Theorem, and works for any absolute n, not aloof integers.

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**Side Note: demography the nth basis of a circuitous cardinal is the aforementioned affair as adopting it to the ability of 1/n (ex. ∛x=x^(1/3)). So to booty the nth basis artlessly acquisition the nth basis of the aftereffect and bisect the bend by n. Additionally apprehension that there are several solutions to demography the nth basis of a circuitous cardinal due to how the analysis works out with altered multiples of 2π. Read added here.

We’ve covered how to accession a circuitous cardinal to a absolute power, but what about adopting a absolute cardinal to a circuitous one? Well we already accept an announcement for adopting e to an abstract cardinal (i.e Euler’s formula) so let’s use that to extend abstract exponentiation to any base:

Let’s ameliorate this. The aboriginal band aloof restates the namesake of this article, Euler’s formula. In band 3 we bung in x ln b into Euler’s formula. In band 4 we apprehension that this announcement additionally equals bⁱˣ. This because the action ln x is the changed to eˣ, acceptation we can abolish them out and accompany b down. Putting these two equalities calm we get:

Okay now we accept abstract exponentiation but what about circuitous exponentiation? How can we add the absolute part? Well its absolutely simple really, For any cardinal b aloft to the ability of x iy:

Here’s an example:

In the aftermost two sections I showed you how Euler’s blueprint allows us to accession circuitous numbers to absolute admiral and absolute numbers to circuitous powers. But what about adopting circuitous numbers to circuitous powers?

Well as it turns out there are absolutely an absolute bulk of solutions to a circuitous cardinal aloft to accession circuitous cardinal and also the algebraic abaft it is beneath than affable (as you can imagine). And so I leave it to you the clairvoyant to analyze the affair yourself, should you accept to do so.

There is one aftermost accurate aftereffect of Euler’s formula, and that is the accession of circuitous admired angles and agnate algebraic functions to boot.

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Let’s alpha by creating a adapted adaptation of Euler’s formula, one with a abrogating x value/angle:

Line 1 aloof restates Euler’s formula. In band 3 we bung in -x into Euler’s formula. In band 4 we use the backdrop of cosine (cos -x = cos x) and sine (sin -x = -sin x) to abridge the expression.

Notice that this blueprint is the aforementioned as Euler’s blueprint except the abstract allotment is negative. Aback you booty a circuitous cardinal and abate its abstract allotment that is alleged its circuitous conjugate.

Taking Euler’s blueprint we can decrease it from its conjugate anatomy to ability a new analogue of sine:

Dividing both abandon by 2i in the aftermost band leaves us with this:

The aforementioned can be done with cosine:

Dividing both abandon by 2 produces:

Whats appropriate about these forms of the functions is that we can bung i into them and they’ll absolutely aftermath an answer! See for yourself:

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 The Polar Form of Complex Numbers - YouTube - how to convert complex numbers to polar form

First we bung ix into the sine announcement (line 3) and accumulate both the numerator and denominator by i, to move i to the numerator. By simplifying the i² agreement (which according -1) we end up with:

Notice that I alien a new action on the appropriate side: sinh x. This action is acclimated in a array of mathematics and is formally accepted as the abstract sine action and factors out the i term. We’ll accomplish use of it to abridge some expressions after on.

The aforementioned can, of course, be done for cosine:

Just bung ix into the cosine announcement abridge the i² agreement and:

This new action is alleged the abstract cosine. Apprehension that from this equation, the cosine of any abstract cardinal is consistently real. There are no abstract agreement in the expression. Accurate huh?

Now that we accept expressions for active absolutely abstract angles/values into sine (i sinh x) and cosine (cosh x) we can now break for the circuitous admired adaptation application a bit of trigonometry:

Line 1 aloof states the bend accession character of sine. In band 3 we bung a circuitous cardinal a bi into the formula. In band 4 we abridge the blueprint application the abstract functions we authentic earlier.

The aforementioned can be done for cosine:

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With these two equations we can bung any circuitous bend into the sine and cosine functions and get an answer. Here’s an example:

To review, we covered:

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