[2sin50°+sin10°(1+根号3 tan10°)]根号(2sin^2 80°)的值
问题描述:
[2sin50°+sin10°(1+根号3 tan10°)]根号(2sin^2 80°)的值
答
原式=[2sin50°+2sin10°*sin(10°+30°)/cos10°]*√2sin80°
=[2cos40°+2sin10°sin40°/cos10°]*√2cos10°
=2√2(cos40°cos10°+sin10°sin40°]
=2√2cos(40°-10°)
=√6