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If pa n dq are perpendicular from the an...

If `pa n dq` are perpendicular from the angular points A and B of ` A B C` drawn to any line through the vertex `C ,` then prove that `a^2b^2sin^2C=a^2p^2+b^2q^2-2a b p qcosCdot`

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CENGAGE ENGLISH-TRIGONOMETRIC FUNCTIONS-All Questions
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