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Math Help - simplify expression

  1. #1
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    simplify expression

    sin 2x - cos 2x sin 2x

    cos x - cos x sin 2x

    can someone told me step by step how to simplify these two expressions?
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  2. #2
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    Quote Originally Posted by alessandromangione View Post
    sin 2x - cos 2x sin 2x

    cos x - cos x sin 2x

    can someone told me step by step how to simplify these two expressions?
    It helps a lot to know that sin(2x)= 2 sin(x) cos(x) and that cos(2x)= cos^2(x)- sin^2(x). You can also use cos(2x)= 2cos^2(x)- 1 and cos(2x)= 1- 2sin^2(x).
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