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Write (i^(25))^3 in polar form....

Write `(i^(25))^3` in polar form.

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`(r^(25))^3=i^(75)=i^(72+3)=(i^(72))(r^3)=(i^4)^(18).i^3=i^2.i=-i` `=isin(-pi/2)`
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