If (cosx)/(costheta)+(sinx)/(sintheta)=(...

If `(cosx)/(costheta)+(sinx)/(sintheta)=(cosy)/(costheta)+(siny)/(sintheta)=1` where `x-y` is not a multiple of `2pi,` then the value of `(cosx.cosy)/(cos^2 theta)+(sinx.siny)/(sin^2 theta )=......[theta != npi,(2n+1)pi/2,n in z]`

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