Question

Integrate cos(2theta)d(theta) from 0 to pi/5

Answer 1

`\int\limits^ ( \pi )/(4) _0 {cos2t} \, dt = (sin2t)/(2) I\limits^ ( \pi )/(4) _0 = \\ = (sin( \pi/2) )/(2)- (sin (0))/(2)= (1)/(2)`
Answer: 1/2