3sinX=sin(2X+Y) 求证:tan(X+Y)=2tanX
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3sinX=sin(2X+Y) 求证:tan(X+Y)=2tanX
你看后面TAN里一个x一个x+y那你就把给你的原式中的2x+y拆开,在消消化化的,试下吧
我觉得能行
3sinX=sin(2X+Y) 求证:tan(X+Y)=2tanX
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