已知函数f(x)=tan(3x+4分之派),求f(9分之派)的值

问题描述:

已知函数f(x)=tan(3x+4分之派),求f(9分之派)的值

1.f(π/9)=tan(π/3+π/4)
=(tanπ/3+tanπ/4)/(1-tanπ/3tanπ/4)
=(√3+1)/(1-√3)
=-√3-2