求值 (cos10°+根号3sin10°)/cos50°
问题描述:
求值 (cos10°+根号3sin10°)/cos50°
答
(cos10°+√3sin10°)/cos50°
=2(1/2*cos10°+√3/2sin10°)/cos50°
=2(cos60°*cos10°+sin60°*sin10°)/cos50°
=2cos50°/cos50°
=2