cos20-cos40-cos80
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cos20-cos40-cos80cos20-cos40-cos80cos20-cos40-cos80cos20-cos40-cos80=cos20-cos(60-20)-cos(60+20)=cos
cos20-cos40-cos80
cos20-cos40-cos80
cos20-cos40-cos80
cos20-cos40-cos80
=cos20-cos(60-20)-cos(60+20)
=cos20-cos60cos20-sin60sin20-cos60cos20+sin60sin20
=cos20-2cos60cos20
=cos20-2*1/2*cos20
=0
cos20'cos40'cos80'等于?
cos20*cos40*cos80=?
cos20-cos40-cos80
cos20*cos40*cos80等于多少
求cos20×cos40×cos60×cos80
cos20°-cos40°-cos80°=
cos20度*cos40度*cos80度=?
cos20度cos40度cos80度
cos20度*cos40 度*cos80 度=?
cos20度-cos40度-cos80度等于?
cos20°cos40°cos80°=?
求值cos20度*cos40度*cos80度
计算cos20°cos40°cos80°
如何化简“(COS20度)*(COS40度)*(COS80度)“?
Cos20度*Cos40度*Cos80度化简求值求详解,是
化简cos20°-cos40°-cos80°等于?
化简cos20°cos40°cos60°cos80°
cos20度cos40度cos80度得值为?