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19 March, 10:04

Which expression is equivalent to sin (2x) - sin x?

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  1. 19 March, 11:10
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    Sin (2x) - sin (x) = 2sin (x) cos (x) - sin (x)

    Since sin (2x) = 2sin (x) cos (x)

    ∴ sin (2x) - sin (x) = sin (x) (2cos (x) - 1)
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