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If xa n dy are of same sign, then the v...

If `xa n dy` are of same sign, then the value of `(x^3)/2cos e c^2(1/2tan^(-1)x/y)+(y^3)/2sec^2(1/2tan^(-1)y/x)` is equal to `(x-y)(x^2+y^2)` (b) `(x+y)(x^2-y^2)` `(x+y)(x^2+y^2)dot` (d) `(x-y)(x^2-y^2)`

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