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17 March, 16:43

Simplify: 20 sin (2x) cos (2x)

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  1. 17 March, 18:50
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    Use the the double angle formula:

    sin (2A) = 2sin (A) cos (A)

    substitute 2x for A, then

    20sin (2x) cos (2x) = 10 (sin (2 (2x)) cos (2 (2x)) = 10sin (4x)
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