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If acostheta+b sintheta=x and asinthet...

If `acostheta+b sintheta=x` and ` asintheta-bcostheta=y` prove that `a^2+b^2=x^2+y^2`

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If acostheta+bsintheta=m and asintheta-bcostheta=n , prove that a^2+b^2=m^2+n^2

If acostheta+bsintheta=m and asintheta-bcostheta=n , Prove that a^2+b^2=m^2+n^2

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