1.

If 0 ltphilt (pi)/(2) ,x= sum_(n=0)^(oo)cos^(2n) phi,y sum _(n=0)^(oo)sin^(2n) phiandz= sum_(n=0) ^(oo) cos ^(2n) phisin^(2n) phi ,then

Answer»

`XYZ=xz+y`
`xyz = xy+z`
`xyz = X +Y+z`
`xyz=yz +x`

ANSWER :B


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