1 / | | atan(x) dx | / 0
Integral(atan(x), (x, 0, 1))
Use integration by parts:
Let and let .
Then .
To find :
The integral of a constant is the constant times the variable of integration:
Now evaluate the sub-integral.
The integral of a constant times a function is the constant times the integral of the function:
Let .
Then let and substitute :
The integral of is .
Now substitute back in:
So, the result is:
Add the constant of integration:
The answer is:
/ / 2\ | log\1 + x / | atan(x) dx = C - ----------- + x*atan(x) | 2 /
log(2) pi - ------ + -- 2 4
=
log(2) pi - ------ + -- 2 4
Use the examples entering the upper and lower limits of integration.