Question

根号sin^2 150°+sin^2 35° +2sin210°+cos^2 3...

根号sin^2 150°+sin^2 35° +2sin210°+cos^2 325° 根号sin^2 150°+sin^2 35° +2sin210°+cos^2 325°

Answer 1

楼主你是不是打错了
题目应该是这样的吧:sin^2
150+sin^2
135+2sin210+cos^2
345
=(1/2)^2+(根号2/2)^2+2乘-1/2+(2+根号3)/4
=1/4+1/2-1+(√3+2)
/4
=(2+根号3)/4-1/4
=1/2+根号3/4-1/4
=1/4+根号3/4
=(1+根号3)/4
不懂的欢迎追问,如有帮助请采纳,谢谢!