神马作文网求值:2sin50°+cos10°(1+根号3tan10°)/根号下1+2sin50°cos50°
来源：学生作业帮 编辑：神马作文网作业帮 分类：综合作业 时间：2024/11/19 01:00:50
求值:2sin50°+cos10°(1+根号3tan10°)/根号下1+2sin50°cos50°
2sin50°+cos10°(1+根号3tan10°)/根号下1+2sin50°cos50°
=(2sin50°+cos10°(1+√3*tan10°))/√(sin^2 50°+2sin50°cos50°+cos^2 50°)
=(2sin50°+cos10°+√3sin10°)/√√(sin50°+cos50°)^2
=(2sin50°+2sin(10°+30°))/(sin50°+cos50°)
=2(sin50°+sin40°)/(sin50°+cos50°)
=2(sin50°+cos50°)/(sin50°+cos50°)
=2
再问： 2(sin50°+sin40°)/(sin50°+cos50°) 这一步怎么来的？没看懂！
再答： cos10°+√3sin10° =2(1/2cos10°+√3/2sin10°) =2(sin30°cos10°+cos30°sin10°) =2sin(30°+10°) =2sin40°
=(2sin50°+cos10°(1+√3*tan10°))/√(sin^2 50°+2sin50°cos50°+cos^2 50°)
=(2sin50°+cos10°+√3sin10°)/√√(sin50°+cos50°)^2
=(2sin50°+2sin(10°+30°))/(sin50°+cos50°)
=2(sin50°+sin40°)/(sin50°+cos50°)
=2(sin50°+cos50°)/(sin50°+cos50°)
=2
再问： 2(sin50°+sin40°)/(sin50°+cos50°) 这一步怎么来的？没看懂！
再答： cos10°+√3sin10° =2(1/2cos10°+√3/2sin10°) =2(sin30°cos10°+cos30°sin10°) =2sin(30°+10°) =2sin40°
求值:2sin50°+cos10°*（1+根号3tan10°）/cs35°cos40°+cos50°cos55°
化简求值2sin50°+cos10°(1+3tan10°)cos35°cos40°+cos50°cos55°
求值:(tan10°-根号3)cos10°÷sin50°
sin50°（1+根号3tan10°）求值、
化简(tan10°-根号3)*(cos10°/sin50°)*(2cos10°-sin20°/cos20°)
sin50°(1+根号3tan10°)
化简：cos10°（tan10°-根号3）/sin50°
求值{cos40°+sin50°(1+根号3tan10°)}/1+sin50°
求值：2sin50°+sin80°(1+3tan10°)1+cos10°
2sin50°(1+根号3tan10°)=?
求值：（tan10°-√3）×cos10°/sin50°
2sin50°+cos10°(1+3tan10°)1+cos10°