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Math Help - I want check my answer please >

  1. #1
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    I want check my answer please >

    Hi

    I want check my answer please >

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  2. #2
    Member kjchauhan's Avatar
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    L.H.S.

    =\frac{\cos^2 z-3\cos z+2}{\sin^2 z}

    =\frac{(1-\cos z)(2-\cos z)}{(1-\cos^2 z)}

    =\frac{(1-\cos z)(2-\cos z)}{(1-\cos z)(1+\cos z)}

    =\frac{(2-\cos z)}{(1+\cos z)}

    =R.H.S.
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  3. #3
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    thanks , but can explain this steps specially the first one
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  4. #4
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    Quote Originally Posted by r-soy View Post
    thanks , but can explain this steps specially the first one
    The numerator has been factorised, the denominator has been re-written using the Pythagorean identity.
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