∫π4−π4dx1+cos2x is equal to
2
1
4
0
2∫π4012cos2xdx=∫π40sec2x=tanx=1
If 2f(x)−3f(1x)=x2(x≠0), then f(2) is equal to
The value of ∫π−π cos2x1+ax dx, a>0 is