$3\left(x+1\right)-3\left(x-2\right)<x+6$

$\frac{d^3}{dx^3}\left(x\cdot\sin\left(x\right)\right)$

$\left(ax-y\right)^2$

$\frac{dy}{dx}\left(15x^2+3^x+18\right)$

$\frac{9x^3-12x^4+21x^2+3}{3x}$

$\int\left(\frac{1}{2}\cos x-\frac{4}{3}\sin x\right)dx$

$\frac{\sec\left(3x\right)-1}{1-\cos\left(3x\right)}$