$\lim_{x\to0}\left(\frac{x^2}{1-\cos^2\left(x\right)}\right)$

$\int r^5\left(1+r^6\right)^7dr$

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

$\frac{10^2-4}{10+2}$

$\left(x-2\right)^2+3x\cdot\left(x+5\right)\cdot\left(x-5\right)$

$-3\left(2a^2b^3c^4\right)$

$x\left(t\right)cos\left(z\left(t\right)+y\left(t\right)\right)=x\left(t\right)cos\left(z\left(t\right)\right)+y\left(t\right)sin\left(z\left(t\right)\right)$