1 / | | 2 | cos (5*x) dx | / 0
Rewrite the integrand:
Integrate term-by-term:
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 a constant times a function is the constant times the integral of the function:
The integral of cosine is sine:
So, the result is:
Now substitute back in:
So, the result is:
The integral of a constant is the constant times the variable of integration:
The result is:
Add the constant of integration:
The answer is:
/ | | 2 x sin(10*x) | cos (5*x) dx = C + - + --------- | 2 20 /
1 cos(5)*sin(5) - + ------------- 2 10
=
1 cos(5)*sin(5) - + ------------- 2 10
Use the examples entering the upper and lower limits of integration.