cos(π/4+x)怎么化简成sin(π/4-x)?
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cos(π/4+x)怎么化简成sin(π/4-x)?cos(π/4+x)怎么化简成sin(π/4-x)?cos(π/4+x)怎么化简成sin(π/4-x)?应该是这样:cos(π/4+x)=sin(π
cos(π/4+x)怎么化简成sin(π/4-x)?
cos(π/4+x)怎么化简成sin(π/4-x)?
cos(π/4+x)怎么化简成sin(π/4-x)?
应该是这样:cos(π/4+x)=sin(π/2-(π/4+x))=sin(π/4-x)这是用了一个变换
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