$7\left(x+2\right)-3\left(x^{2}+2x\right)+3$

$\cos\left(2\left(x\right)+\left(x\right)\right)=4\cos^3\left(x\right)-3\cos\left(x\right)$

$\left(2x-a\right)\left(2x-a\right)$

$\frac{d^2}{dx^2}\frac{\left(x+1\right)^2}{\left(x-1\right)}$

$\int\left(\sec\left(x+3\right)^2\right)dx$

$\frac{d}{dx}\frac{log\:3x^3}{e^{2x}}$

$4-3x-x^2\ge0$