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March 25, 2017

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I am having difficulty with two problems:

1) Evaluate (1+i)^12 by using DeMoivre's Theorem. Express the result in rectangular form.
So far I have: r=sqrt(1)^2+(1)^2 which simplified is sqrt2. Don't know how to proceed.

2) Write the polar equation theta = 45 degrees in rectangular form.
I don't even know how to proceed to do this.

Any help would be great!

  • Pre-calculus - ,

    (1+i)^12 is sqrt2 @ 45 to the 12th power, or sqrt2 ^12 @45x12

    1@45 is .707i + .707j where i,j are unit vectors in the x,y directions.

  • Pre-calculus - ,

    x = r cos(45) ...(1)
    y = r sin(45) ...(2)

    Dividing (2) by (1):
    y / x = tan(45) = 1
    y = x.

  • Pre-calculus - ,

    find the distance between points at (6,-3) and (-1,4). The answer I got was 9.9 and it was wrong.
    please help!

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