If x sin theta = y cos theta = ( 2 z tan...

If `x sin theta = y cos theta = ( 2 z tan theta)/(1 - tan ^(2) theta) ,` then what is `4z ^(2) (x ^(2) + y ^(2)) ` equal to ?

A

A. `(x^(2) + y ^(2)) ^(3)`

B

B. `(x ^(2) - y ^(2)) ^(2)`

C

C. `(x ^(2) - y ^(2)) ^(3)`

D

D. `(x ^(2) + y ^(2)) ^(2)`

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