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trigonometry

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{1/(sec x - 1)} - {1/(sec x +1)} = 2 cot^2 x

solve using identities?

  • trigonometry - ,

    Hey, I did this for you long ago.

  • trigonometry - ,

    Twice in fact

  • trigonometry - ,

    copy again
    sin a cos b + cos a sin b = sin (a+b)
    so sin (7t)

    1/(1/cos x -1) - 1/(cos x +1)

    cos x/(1 - cos x) - cos x/(1+cos x)

    [cos x(1+cos x) - cos x(1-cos x)]/(1-cos^2 x)

    [ cos x + cos^2x - cos x +cos^2 x]/sin^2x

    2 cos^2 x/sin^2 x

    2 cot^2 x

  • trigonometry - ,

    ohh, i didn't realize! thankyou :)

  • trigonometry - ,

    Please check before repeating posts. Some other teacher might have done it all over again.

  • trigonometry - ,

    okay!

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