If sin 17^@ = x/y,then the value of sec ...

If `sin 17^@ = x/y`,then the value of `sec 17^@ - sin 73^@` is

A

`x^2/(y sqrt(x^2-y^2))`

B

`y^2/(x sqrt(x^2-y^2))`

C

`y^2/(x sqrt(y^2-x^2))`

D

`x^2/(y sqrt(y^2-x^2))`

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