1 / | | 1 | 1*--------- dx | 2 | cos (3*x) | / 0
Integral(1/cos(3*x)^2, (x, 0, 1))
/ | | 1 sin(3*x) | 1*--------- dx = C + ---------- | 2 3*cos(3*x) | cos (3*x) | /
oo
=
1606.32063557435
Use the examples entering the upper and lower limits of integration.