$3\left(2x\:+\:5\right)\left(x\:-\:4\right)$

$\left(a+3m\right)\left(a-3m\right)$

$\int\frac{\sin y}{\cos y}dy$

$\log\left(x-4\right)=-3$

$\frac{8x^3-10x^2+5x+4}{2x-1}$

$tan\left(t\right)+\frac{1}{tan\left(t\right)}=\frac{1}{sin\left(t\right)cos\left(t\right)}$

$2\cdot\frac{3}{5}m^{2}-2mn+\frac{1}{10}m^{2}-\frac{1}{3}mn+2mn-2n^{2}$