设M＝cos20°×cos40°×cos60°×cos80°×cos100°×cos120°×cos140°×cos160°,求证：M＝1/256
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设M＝cos20°×cos40°×cos60°×cos80°×cos100°×cos120°×cos140°×cos160°,求证：M＝1/256设M＝cos20°×cos40°×cos60°×cos
设M＝cos20°×cos40°×cos60°×cos80°×cos100°×cos120°×cos140°×cos160°,求证：M＝1/256
设M＝cos20°×cos40°×cos60°×cos80°×cos100°×cos120°×cos140°×cos160°,求证：M＝1/256
设M＝cos20°×cos40°×cos60°×cos80°×cos100°×cos120°×cos140°×cos160°,求证：M＝1/256
设M＝cos20°×cos40°×cos60°×cos80°×cos100°×cos120°×cos140°×cos160°,求证：M＝1/256
cos20°-cos40°-cos80°=
求值 cos10°cos20°cos40°
cos20°cos40°cos80°=?
计算cos20°cos40°cos80°
化简cos20°cos40°cos60°cos80°
cos20°*cos40°*cos60°*cos80°=
cos20°cos40°cos60°cos80°是多少
sin20°cos40°+cos20°sin40°=
（cos20°-cos40°)/(sin20°-sin40°）=?
计算：sin20°cos40°+cos20°sin40°=
不查表求:cos20°*cos40°*cos60°*cos80°=
求值cos10°分之sin20°cos20°cos40°.
化简：(sin20°cos20°cos40°)/cos10°
sin10°cos20°sin30°cos40°等于多少
计算:(sin20°-sin40°)÷(cos20°-cos40°)
计算:(sin20°-sin40°)÷(cos20°-cos40°),
化简cos20°-cos40°-cos80°等于?