$\frac{\sec^{2}\beta-1}{\cot\beta}$

$x\left(7y+36\right)+4x^2+15y^2+45yx\left(7y+36\right)+4x\:2\:+15y\:2\:+45$

$\left(x+4\right)\left(x-1\right)m$

$\left(3x^2+\frac{1}{x}\right)^y$

$\lim_{x\to1}\left(\frac{x^3-5x^2+7x-3}{x^2+3x+3}\right)$

$90-60w$

$\frac{2x^4-x^3+x^2-10}{x-3}$