求值:cos10°/cos50°
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求值:cos10°/cos50°
求值:cos10°/cos50°
求值:cos10°/cos50°
cos10/cos50
=sin(90-10)/sin(90-50)
=sin80/sin40
=2sin40cos40/sin40 (sin2x=2sinxcosx 两倍角公式)
=2cos40
求值:cos10°/cos50°
求值 (cos10°+根号3sin10°)/cos50°
求值:cos10°cos40°+cos80°cos50°请写出详细过程
cos10°+cos110°-cos50°=
求值:2sin50°+cos10°(1+根号3tan10°)/根号下1+2sin50°cos50°
(sin10°+cos50°)/(cos10°-sin50°)?
sin10°cos50°+sin50°cos10°
sin10°cos50°+sin50°cos10°
cos80°*cos50°+cos10°*cos40°=
求值:cos50°(根号3-tan10°)
求(sin40°+cos10°)/cos20° =(cos50°+cos10°)/cos20°
求值:2sin50°+cos10°*(1+根号3tan10°)/cs35°cos40°+cos50°cos55°是cos35° 不好意思。打错了
求值 cos10°cos20°cos40°
cos60°cos10°/cos50°=cos10°sin50°/2sin50°cos50° 这一步怎么出来啊
求值sin70°cos50°+sin20°sin50°=?
cos40°cos70°+cos30°cos50°求值
(cos10°-cos50°)÷(sin10°-sin50°)
sin10°cos50°+sin50°cos10°的三角函数值