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Hlww.........A question for u..........Prove this:(sec A-cosA)(cot A+tanA)=secAtanA |
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Answer» Answer: =(1/cosA - cosA) * cosA/sinA + sinA/cosA) =(1-cos^2A)/cosA * (SIN^2A + cos^2A ) / sinA cosA) ={(sin^2A) /cosA}*(1/sinA cosA) =sinA/cos^2A = (sin A/cosA)*(1/cosA)=tanA*secA=RHS |
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