calc

If z = 2cis 60°, find z^4 in rectangular form.

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asked by serena
  1. z = 2 cosine 60 + 2 i sin 60

    z= 2 e^i(60)

    z^4 = 16 e^i(240)
    = 16 cos 240 + 16 i sin 240
    = 16 (-.5 )+ 16 i(-.866 )
    = -8 - 13.86 i

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    posted by Damon

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