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

User Xhino
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1 Answer

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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)

User Kaarto
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