(1/2)已知函数f（x)=sinx+tanx,项数为27的等差数列{an}满足an属于（-90',90'),且公差d不为零,若f_数学解答

(1/2)已知函数f（x)=sinx+tanx,项数为27的等差数列{an}满足an属于（-90',90'),且公差d不为零,若f(a1)+f(

人气：487 ℃　时间：2020-01-27 10:45:51

解答

f(x)=sinx+tanxan=a1+(n-1)df(a1)=sina1+tana1f(a2)=sin(a1+d)+tan(a1+d)f(a3)=sin(a1+2d)+tan(a1+3d)..f(a26)=sin(a1+25d)+tan(a1+25d)f(a27)=sin(a1+26d)+tan(a1+26d)f(a1)+f(a27)=sina1+sin(a1+26d)+tana1+tan(a1...