cos20/cos10=?
3个回答
2cos10sin10/cos10=2sin10
相关问题
cos20°cos10°-cos70°cos80°
sin10°cos20°+cos10°sin20°=多少
[2cos10°/cos20°]-tan20°=______.
cos20°cos10°+sin10°sin10°
(-sin20°+2cos10°)÷cos20°=?
cos10°—cos20°怎么算?
化简cos20/cos70-2cos10=
﹙1/cos²80-3/cos²10﹚·1/cos20
(sin50°(1+√3tan10°)-cos20°)/cos80°√(1-cos20°
求(2cos10°-sin20°)/cos20°的值