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

$\frac{x^2}{x^y}$

$3x^3+4x^2+10x+9x^3+7-3x^3+4x^2-5x-9$

$\frac{d}{dx}\left(3y^2-x^2=9\right)$

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

$\sin\left(x\right)-\cos\left(2x\right)=-1$

$\left(sinx\right)\left(cosx\:-sinx\right)$