If x= sum(n=0)^oo (Costheta)^(2n) , y= s...

If `x= sum_(n=0)^oo (Costheta)^(2n) , y= sum_(n=0)^oo (Sinphi)^(2n) , z= sum_(n=0)^oo (Cosphi)^(2n). (Sintheta)^(2n)` Then which of the following is true ??

A

`xy+z=xyz`

B

`xy-z=(x+y)z`

C

`xyz=4`

D

`xy+zy+zx=z`

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