f(x)=2sinπ/4cosπ/4-2根号3sin^2π/4+根号3

f(x)=2sinπ/4cosπ/4-2根号3sin^2π/4+根号3
f(x)=2sinπ/4cosπ/4-2根号3sin^2π/4+根号3

f(x)=2sinπ/4cosπ/4-2根号3sin^2π/4+根号3
f(x)=2sinπ/4cosπ/4-2√3sin²π/4+√3
=sinπ/2+√3(1-2sin²π/4)
=1+√3cosπ/2
=1

前面那个2sinπ/4cosπ/4
合起来。就是sinπ/2=1
2根号3sin^2π/4拆开太麻烦了。sin^2π/4=根号2的平方。就是2
4根号3+根号3+1
最后就是1+5根号3

f(x)=2sinπ/4cosπ/4-2√3sin^2π/4+√3
=sinπ/2-2√3sin^2π/4+√3
=1-2√3sin^2π/4+√3
=1-2√3*1/2+√3
=1-√3+√3
=1