Question

sina*cos2a-cos(-a)*sin(-2a​

Answer 1

$\sin( \alpha ) \times \cos(2 \alpha ) - \cos( - \alpha ) \times \sin( - 2 \alpha ) \\ \\ \sin( \alpha ) \times \cos(2 \alpha ) + \cos( \alpha ) \times \sin(2 \alpha ) \\ \\ \sin(3 \alpha )$

$otvet( \sin(3 \alpha )$

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