$300\cdot12$

$3a+7b-4c-7a+10b-5c-6a-5b-c$

$\frac{dy}{dx}=y^2+36$

$\frac{tan^2\left(x\right)}{sec\left(x\right)}=\frac{\left(sec^2\left(x\right)-1\right)}{sec\left(x\right)}$

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

$\frac{dy}{dx}=2y^3-3y^2-2y$

$\int\left(4x-1\right)\left(2x^2-x+1\right)^2dx$