求值:sin(10°+x)cos(50°-x)+sin(50°-x)cos(10°+x)
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求值:sin(10°+x)cos(50°-x)+sin(50°-x)cos(10°+x)
求值:sin(10°+x)cos(50°-x)+sin(50°-x)cos(10°+x)
求值:sin(10°+x)cos(50°-x)+sin(50°-x)cos(10°+x)
套公式啊,sin(10°+x)cos(50°-x)+sin(50°-x)cos(10°+x)=sin(10°+x+50°-x)=sin60°=√3/2.
求值:sin(10°+x)cos(50°-x)+sin(50°-x)cos(10°+x)
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