$3x+2^2$

$\lim\infty\left(\frac{-e^{-x}}{\frac{1}{-x^2}}\right)$

$3x^3+5x^6-6x^2-10x^5$

$y^4-40y^2+124$

$\tan\left(-x\right)\cdot\sec\left(-x\right)\cdot\cot\left(x\right)$

$\lim_{x\to4}\left(\frac{x}{\sqrt{x^2-9}}\right)$

$\left(4x^2+16x+64+\frac{256}{x-4}\right)\left(x-4\right)\left(x^2+4x+16\right)$