For 0ltphilt(pi)/(2)" if " x=sum(n=0)^(o...

For ``0ltphilt(pi)/(2)" if " x=sum_(n=0)^(oo)cos^(2n) phi,y=sum_(n=0)^(oo)sin^(2n)phi" and "z=sum_(n=0)^(oo)cos^(2n)phisin^(2n)phi`, then

`xyz=xz+y`

`xyz=xy+y`

`xyz=x+y+z`

`xyz=yz+x`

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