cos5°/(sin50°+cos50°)=?

来源：学生作业帮编辑：神马作文网作业帮分类：数学作业时间：2024/11/17 17:56:57

cos5°/(sin50°+cos50°)=?
不好意思，打错了，是根号2cos5°/(sin50°+cos50°)=?

cos5°/(sin50°+cos50°)
=cos5°/√2(√2/2sin50°+√2/2cos50°)
=1/√2*[cos5°/(sin50°cos45°+cos50°sin45°)]
=1/√2*cos5°/sin95°
=1/√2*1
=1/√2.
=√2/2

sin50°=a cos40°=?cos50°? 计算1sin50°+3cos50° 2sin50°cos50°怎么等于cos50°cos40°+sin50°sin40° 计算sin50°cos40°+cos50°sin40° sin50°*cos40°+cos50°*sin40° (sin40°cos50°+sin50°cos40°)=1 怎么等于1的啊化简【2sin50°+sin80°(1+√3tan10°)】/cos5° 求值：[2sin50°+sin80°（1+√3tan10°）]/√2cos5° 求值:2sin50°+cos10°*（1+根号3tan10°）/cs35°cos40°+cos50°cos55° 化简求值2sin50°+cos10°(1+3tan10°)cos35°cos40°+cos50°cos55° cos40/sin40 =sin50/cos50.这步是怎么化的三角函数之求值问题sin²20°+cos²50°+sin20°cos50°=sin20°cos50