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If cos21^@ = frac(x)(y), then cosec21^@ ...

If `cos21^@ = frac(x)(y)`, then `cosec21^@ - cos 69^@` is equal to
(A) `frac(x^2)(ysqrt(y^2-x^2)` (B) `frac(y^2)(xsqrt(y^2-x^2 )` (C ) `frac(y^2)(xsqrt(x^2-y^2)` (D) `frac(y^2) (xsqrt(x^2 - y^2)`

A

D

B

C

C

A

D

B

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