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Math Help - simply the expression as far as possible

  1. #1
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    simply the expression as far as possible

    i don't understand how 4 sin x cos x can be simplified into 2 sin 4x....can anyone show me the process?
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  2. #2
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    Smile

    Quote Originally Posted by alessandromangione View Post
    i don't understand how 4 sin x cos x can be simplified into 2 sin 4x....can anyone show me the process?
    4\sin x \cos x=2\left ( 2\sin x\cos x \right )=2\sin2x.
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  3. #3
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    oh thanks...it was so easy haha
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