$\lim_{x\to\infty}\left(\frac{x^a}{b^n}\right)$

$36x^2+120x+14$

$cos\:x\cdot\frac{dy}{dx}+sin\:x\cdot y=1$

$\frac{dy}{dx}\left(y=cosh^2\left(3x\right)\right)$

$\left(-624\right)+\left(-546\right)$

$15c^2d^2\left(c+4d\right)$

$\left(5x+y\right)\left(2a-b\right)+\left(y+5x\right)\left(b-2a\right)$