【2sin50°+sin10°(1+根号3tan10°】*根号2sin²80°=
问题描述:
【2sin50°+sin10°(1+根号3tan10°】*根号2sin²80°=
答
1+根号3tan10°=(cos10°+根号3sin10°)/cos10°=2(1/2×cos10°+1/2×根号3sin10°)/cos10°=2(cos60°cos10°+sin60°sin10°)/cos10°=2cos50°/cos10°根号2sin²80°------------------做了好久,这个sin...