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let 0ltphiltpi/2, x=sum(n=0)^oocos^(2n)p...

let `0ltphiltpi/2`, `x=sum_(n=0)^oocos^(2n)phi`, `y=sum_(n=0)^oosin^(2n)phi` and `z=sum_(n=0)^oocos^(2n)phisin^(2n)phi`

A

xz + yz + z = xy

B

xz + yz + xy = Z

C

xz + yz - z = xy

D

None of these

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The correct Answer is:
A
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