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10 February, 06:01

Simplify 5 (cis7pi/4) ^4

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  1. 10 February, 06:43
    0
    -625

    Step-by-step explanation:

    The magnitude gets raised to the power, and the angle gets multiplied by the power:

    5 (cis7pi/4) ^4 = (5^4) cis (4·7π/4) = 625cis (7π) = 625cis (π) = - 625
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