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Prove : sin A - 2 …

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Prove : sin A - 2 sin ^3 A over 2cos^3 A -cosA = tanA

    • Posted by Manpreet Kaur 6 years, 10 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Sneha Singh 6 years, 10 months ago

    SinA(1-2sin²A)/cosA(2cos²A-1) =sinA{1-2(1-cos²A)}/cosA(2cos²A-1) =SinA{2cos²A-1}/cosA(2cos²A-1) =SinA/cosA=tanA

    1Thank You

    Vanshika Sheokand 6 years, 10 months ago

    SinA(1-2sin^2A)/cosA(2cos^2A-1)........sinA(sin^2A+cos^2A-2sin^2A)/cosA(2cos^2A-sin^2A-cos^2A)..................sinA(cos^2A-sin^2A)/cos(cos^2A-sin^2A)...............sinA/cosA...........tanA

    1Thank You

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