cos(x+y)=?sin(x+y)=?
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cos(x+y)=?sin(x+y)=?
如题
如题
cos(x+y)=cosxcosy-sinxsiny
sin(x+y)=sinxcosy+cosxsiny
sin(x+y)=sinxcosy+cosxsiny
证明COS(X+Y)COS(X-Y)=COS^2X-SIN^2Y
cos(x+y)=?sin(x+y)=?
求证:sin(x-y)/(sinx-siny)=cos[(x-y)/2]/cos[(x+y)/2]
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