化简:1+sin(x-360度)cos(x-270度)-2cos平方x
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化简:1+sin(x-360度)cos(x-270度)-2cos平方x化简:1+sin(x-360度)cos(x-270度)-2cos平方x化简:1+sin(x-360度)cos(x-270度)-2c
化简:1+sin(x-360度)cos(x-270度)-2cos平方x
化简:1+sin(x-360度)cos(x-270度)-2cos平方x
化简:1+sin(x-360度)cos(x-270度)-2cos平方x
sin(x-360)=sinx
cos(x-270)=cos(x+90)=-sinx
1=sin^2 x+cos^2 x
1+sin(x-360度)cos(x-270度)-2cos平方x =sin^2 x+cos^2 x-sin^2 x -2cos^2 x=-cos^2 x
=1+sinx(-sinx)-2cos平方x
=sin平方x+cos平方x-sin平方x-2cos平方x
=-cos平方x
应该是这样
化简:1+sin(x-360度)cos(x-270度)-2cos平方x
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