若函数f(n)=sinn π/6(n∈Z),求f(1)+f(2)+...+f(102)的值
若函数f(n)=sinn π/6(n∈Z),求f(1)+f(2)+...+f(102)的值
日期:2017-10-02 06:36:37 人气:2
解函数f(n)=sinn π/6
的周期T=2π/(π/6)=12
f(1)=sinπ/6=1/2
f(2)=sin2π/6=√3/2
f(3)=sin3π/6=1
f(4)=sin4π/6=√3/2
f(5)=sin5 π/6=1/2
f(6)=sin6π/6=0
f(7)=sin7π/6=-1/2
f(8)=sin8π/6=-√3/2
f(9)=s