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If the straight line x cos α + y sin α = p touches the curve x2a2+y2b2=1, then prove that a2cos2α+b2sin2α=p2. |
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Answer» If the straight line x cos α + y sin α = p touches the curve x2a2+y2b2=1, then prove that a2cos2α+b2sin2α=p2. |
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