$\int\frac{2x\log\left(x^2+1\right)}{\left(x^2+1\right)}dx$

$\lim_{x\to0}\left(\frac{7+7x+3x^2-7e^x}{1-\cos\left(x\right)}\right)$

$\lim_{x\to0}\left(\frac{x^2-5x+6}{x^2-3x+2}\right)$

$\lim_{x\to\infty}5x^2e^{-2x}$

$3m\:x\:4mn\:x-5mn^2$

$\int_0^{\pi}\left(\tan\left(3x\right)\right)dx$

$\int2te^{\frac{t}{5}}dx$