$\lim_{x\to0}\left(\frac{cos\left(2x\right)-\cos\left(4x\right)}{x^2}\right)$
$-396+100$
$\lim_{x\to-\infty}\left(\frac{5x^2+3x+1}{10x^2+x+2e^{-x}}\right)$
$\frac{x^3}{4x^4}$
$25n^2-10nz+z^2$
$\int2\cdot arctan\left(2x\right)dx$
$3y^2=24x$
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