Why can't I do $u$ substitution on $\int \cos^4x dx$?
114956
Integrate $\int \cos^4 x\,\mathrm dx.$
145364
units in indefinite integral
104138
How to integrate $\int\limits_0^\infty e^{-a x^2}\cos(b x) dx$ where $a>0$
31922
Integral of $\sin x \cos x$ using two methods differs by a constant?
117602
How to evaluate $\int \cot^2(x) \;\mathrm dx$?
506
Finding $\int x^xdx$
10366
Why do we not include $c$ in the computation of the definite integral?
32480
Limit of integration can't be the same as variable of integration?
148632
How to expand $\cos nx$ with $\cos x$?
8502
Why aren't integration and differentiation inverses of each other?
72351
Applying integral substitution rule to $ \int \frac{mx+n}{ax+b} \mathrm{d}x$
142651
Where can you perform variable substitution in an equation?
83610
Why does substitution work in antiderivatives?
35274
What is wrong with this substitution?
138230
Evaluate $ \int^{\frac{\pi}{2}}_0 \frac{\sin x}{\sin x+\cos x}\,dx $ using substitution $t=\frac{\pi}{2}-x$
91196
Complex Integration of $\int_0^\infty e^{-ax}\cos(bx)\,dx$
105260
How to integrate $\int\sqrt{x^2+1}dx$