$5x^{4}x+3y+5x^{4}+3$

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

$8x^3-2-3x-2$

$5\sec^2\left(x\right)\cdot sin\left(2x\right)$

$\int\sec^4ax\:dx$

$\lim_{x\to1}\left(\frac{x^2\left(x^2+1\right)}{x^2-1}\right)$

$\lim_{x\to-infinity}\left(x+1+x^2\right)$