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

` 0 lt phi lt (pi)/(2) , x= underset(n=0) overset(infty )sum cos ^(2nphi), y = underset(n=0)overset(infty)sum sin ^(2nphi) and z = underset(n=0) overset(infty)sum cos ^(2n) phi sin ""^(2)n phi , `then :
a)` xyz =xz+y ` b)` xyz =xy +z` c)` xyz =x+y +z` d)` xyz=yz +x`

A

` xyz =xz+y `

B

` xyz =xy +z`

C

` xyz =x+y +z`

D

` xyz=yz +x`

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The correct Answer is:

B

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