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If 0 lt phi lt (pi)/(2) , x= sum(n=0)...

If `0 lt phi lt (pi)/(2) , x= sum_(n=0)^(oo) cos^(2n) phi ,y sum _(n=0)^(oo) sin ^(2n) phi and z = sum _(n=0) ^(oo) cos ^(2n) phi sin ^(2n) phi , ` then

A

`2y = x + z`

B

`2x = y + z`

C

`y = (x + z)/(xz)`

D

`y = (2xz)/(x + z)`

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The correct Answer is:
D
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