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28 April, 04:12

Simplify the expression using the appropriate identities. (Do not use calculator)

sin 9° cos 10° - cos 9º sin 10° =

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  1. 28 April, 04:38
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    sin - 1 degrees.

    Step-by-step explanation:

    sin (A - B) = sin A cos B - cos A sin B

    Therefore sin 9° cos 10° - cos 9º sin 10° = sin (9 - 10)

    = sin - 1 degrees.
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