$\lim_{x\to\infty}cos\left(e^{\frac{\left(-x\right)}{\left|sinx\right|}}\right)$

$52mn-36+28mn^3$

$\frac{x^2-5}{x}$

$\int_2^{\infty}\left(\frac{1}{1-x^2}\right)dx$

$\left(m^4\right)\left(m^3\right)\left(m^2\right)\left(m\right)^0$

$\left(7x^2+7x^2\right)dx+14xydy=0$

$\lim_{x\to-\infty}\left(\frac{3x^5-5x}{6x^2+2x-1}\right)$