Calculus

I have a problem about complex number.

Let z=7e^(7*pi*i/4) .

Write z, z^4, z^7, z^(-2) in the form a + b i

I have no idea how to do it. Any hints will be appreciated.

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  1. z=7e^(7*pi*i/4)

    z^4 = 7^4 e^(7*pi*i)

    And then you use that
    e^(i theta) = cos(theta) + i sin(theta)

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