8sin(180–2A)怎么算？ sin(–a–180)等于多少

sin(180\u2013a)\u7b49\u4e8esin(a\u2013180)\u5417\uff0c\u4ed6\u4eec\u6709\u4ec0\u4e48\u533a\u522b\uff1f

\u4e0d\u7b49\u4e8e\uff0c\u52a0\u4e2a\u8d1f\u53f7

\u5982\u56fe

sin(180°–2A)=sin2A=2sinAcosA.
可以吗？

8sin(180鈥2A)鎬庝箞绠?
绛旓細sin(180掳鈥2A)=sin2A=2sinAcosA.鍙互鍚楋紵

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