(sin15°cos25°-sin40°)/(cos15°cos25°-cos40°)
求cos25°cos15°-cos75°sin15°解答过程
求cos15°-tan15°/cos15°+sin15°
(cos15°-cos75°)(sin75°+sin15°)怎么化简?
cos75°cos15°+sin75°sin15°的值为( )
(cos15°-cos75°)(sin75°+sin15°)=?
tan15°+cos15°/sin15°的值 求详解
求sin15°+tan30°cos15°的值
求值:(sin20°-sin40°)/cos20°-cos40°)
sin20°cos40°+cos20°sin40°的值等于( )
sin10°^2+cos40°^2+sin10°sin40°
计算sin50°cos40°+cos50°sin40°
sin40°cos10°-cos40°sin10°