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

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

A

`xy +z`

B

`xy+y`

C

`x+y+z`

D

`yz+x`

Text Solution

Verified by Experts

The correct Answer is:
A, C
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