sin(–a–180)等于多少 为什么这个sin(A +B )=sinC?
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
\u56e0\u4e3aA+B+C=\u03c0 ,sin(\u03c0-C)=sin(A+B)
如图
图
绛旓細sin(180掳鈥2A)=sin2A=2sinAcosA.鍙互鍚楋紵
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