sin10°乘以sin40°+sin50°乘以80°
sin10°+sin20°+sin30°+sin40°+sin50°+……+sin2000°=?
sin40°cos10°-SIN10°SIN50°的值是
sin10°^2+cos40°^2+sin10°sin40°
sin40°*(1-sin10°)/[sin10°*(cos20°)^2]
sin10°sin50°-sin50°sin70°-sin70°sin10°=?
计算 sin10°^2 + sin50°^2 + sin10°sin50° 的值? 答案:3/4
sin10°+sin20°+sin40°+sin50°+sin70°+sin80°求步骤加答案各方学霸求解答谢谢啦!
计算sin50°cos40°+cos50°sin40°
sin50°*cos40°+cos50°*sin40°
sin40°cos10°-cos40°sin10°
2sin50°cos50°怎么等于cos50°cos40°+sin50°sin40°
sin20°×cos7o°+sin10°×sin50°的值