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math (trigonometry)

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help me solve this coz im stumped

secx-secx sin^2x= cosx


thanks

  • math (trigonometry) -

    sec x (1 - sin^2x) = cos x
    sec x * cos^2 x = cos x
    (1/cos x)*(cos^2 x) = cos x
    cos x = cos x

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