$x\left(1+y^2\right)^{0.5}dx=y\left(1+x^2\right)^{0.5}dy$

$9x\:^2-100$

$\lim_{n\to\infty}\left(e^{-n}\right)$

$cos^2u$

$\int\frac{2x^5}{\sqrt{7-4x^6}}dx$

$\int_0^1\left(\frac{8}{\left(x^2+1\right)\left(x^2+4\right)}\right)dx$

$\left(-12\right)+\left(6-8\right)\cdot\left(-1\right)$