化简y=sin(x+20度)+sin(x+80度
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化简y=sin(x+20度)+sin(x+80度
化简y=sin(x+20度)+sin(x+80度
化简y=sin(x+20度)+sin(x+80度
和差化积,y=2sin(x+50°)cos30°=√3sin(x+50°).
化简y=sin(x+20度)+sin(x+80度
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