00:01
Hello, we want to write the complex number as in polar form with the argument theta between 0 and 2 pi so we have 0 plus 2i or just 2i and that's what we want to convert so we know so we know this is equal to r times r times the cosine of theta plus i times sine of theta so we just have to solve for r and for theta.
00:24
So let's do r first so we know r squared is equal to x squared plus y squared where x is the real part and and y is the imaginary part, it's a complex number.
00:35
So r squared is equal to 0 squared, so 0 plus y squared.
00:39
So 4, r is equal to the square root of 4, which is just 2.
00:44
Now we have to solve for theta.
00:46
So 10 theta is equal to y over x.
00:50
And since x is 0, we get theta is equal to the 10, or here, we can't even solve it.
00:58
We can't even take the 10 inverse because, because, because 10 theta is equal to 2 over 0.
01:10
You can't even take the 10 inverse of that because that's undefined.
01:13
So we have to use our knowledge of the unit circle.
01:15
So let's draw real quick right over here...