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Question Number 143641 by mathlove last updated on 16/Jun/21

$$\sin 160-\sin 20=?$$

Answered by Rasheed.Sindhi last updated on 16/Jun/21

$$\sin 160-\sin 20$$$$=\sin (180-20)-\sin 20$$$$=\sin 180\cos 20-\cos 180\sin 20-\sin 20$$$$=0.\cos 20-(-1)\sin 20-\sin 20$$$$=\sin 20-\sin 20=0$$

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