- #1
songoku
- 2,340
- 340
- Homework Statement
- Find
$$\int x \sqrt{1+4 \cos^2 (x)} dx$$
- Relevant Equations
- High School Integration:
integration by substitution
integration by part
integration of trigonometry function
Is it possible to do the integration? That is the full question
I don't know where to start, try to use ##u=\cos x## and also ##\cos^2 (x) = \frac{1}{2} + \frac{1}{2} \cos (2x)## but failed.
Thanks
I don't know where to start, try to use ##u=\cos x## and also ##\cos^2 (x) = \frac{1}{2} + \frac{1}{2} \cos (2x)## but failed.
Thanks