化简:[2sin50°+sin10°*(1+√3 tan 10°)]√2sin^2 80°
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:2024/11/19 16:13:11
化简:[2sin50°+sin10°*(1+√3 tan 10°)]√2sin^2 80°
∵cos10+√3sin10
=2[(1/2)cos10+(√3/2)sin10]
=2(cos60cos10+sin60sin10)
=2cos(60-10)
=2cos50
∴{2sin50+[1+(√3)tan10]sin10}×√[2(sin80)^]
={2sin50+[1+(√3)(sin10/cos10)]sin10}×√[2(sin80)^]
={2sin50+[1+(√3)(sin10/cos10)]sin10}×√[2(sin80)^]
={2sin50+[cos10+(√3)(sin10)]sin10/cos10}×√[2(sin80)^]
=[2sin50+(2cos50sin10/cos10)]×(√2)(sin80)
=2[(cos10sin50+cos50sin10)/cos10]×(√2)cos10
=2(sin60/cos10)×(√2)(sin80)
=(2√2)×(√3)/2=√6
=2[(1/2)cos10+(√3/2)sin10]
=2(cos60cos10+sin60sin10)
=2cos(60-10)
=2cos50
∴{2sin50+[1+(√3)tan10]sin10}×√[2(sin80)^]
={2sin50+[1+(√3)(sin10/cos10)]sin10}×√[2(sin80)^]
={2sin50+[1+(√3)(sin10/cos10)]sin10}×√[2(sin80)^]
={2sin50+[cos10+(√3)(sin10)]sin10/cos10}×√[2(sin80)^]
=[2sin50+(2cos50sin10/cos10)]×(√2)(sin80)
=2[(cos10sin50+cos50sin10)/cos10]×(√2)cos10
=2(sin60/cos10)×(√2)(sin80)
=(2√2)×(√3)/2=√6
[2sin50°+sin10°(1+√3tan10°)]•√(sin²80°)
化简[2sin50°+sin10°(1+√3tan10°)] √(sin²80°)尽量简单点
求值:[2sin50°+sin10°(1+√3tan10°)]√(1-sin^2 10°)
化简:[2sin50°+sin10°(1+根号3*tan10°)]*根号sin^280°
[2sin50°+sin10°(1+根号3 tan10°)]根号(2sin^2 80°)的值
化简[2sin50°+sin10°(1+√3tan10°)] √(2sin280°)
求值:[2sin50°+sin10°(1+√3tan10°)]×√2sin80°
计算 sin10°^2 + sin50°^2 + sin10°sin50° 的值? 答案:3/4
【2sin50°+sin10°(1+根号3tan10°】*根号2sin²80°=
[2sin50°+sin10°(1+根号3tan10°)]乘sin10°等于?
求[2sin50°+sin10°(1+√3tan10°0]sin80°的值
一道高一计算题,化简[2sin50°+sin10°(1+根3 *tan10°)]*根2sin〃80°(第二个根号下是一个