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Prove that the two straight lines represented by (x^2 + y^2).sin^2 (alpha)=[x cos(theta) - y sin (theta)]^2 include an angle 2(alpha).?

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  • Prove that the two straight lines represented by (x^2 + y^2).sin^2 (alpha)=[x cos(theta) - y sin (theta)]^2 include an angle 2(alpha).?


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