$\left(2a+5a+4\right)^2$

$\left(\cos x-2\right)\left(\sin x+2\right)=0$

$\left(3^7\right)^2$

$\frac{d}{dx}\left(\frac{\left(\sin\:\left(x\right)\right)^5\left(x^4+3x^3\right)^4}{\left(\cos\left(x\right)\right)^2}\right)$

$-500+117$

$\left(x^2+xy+xy+y^2\right)\left(x+y\right)$

$2x+4x+\left(8x+3x-10-x\right)$