$-4x^3y^3\left(5x-1\right)$

$\lim_{x\to0}\left(\frac{\sin\left(6x\right)^2}{x^2\cos\left(2x\right)}\right)$

$4\left(-8d-1\right)$

$\frac{dy}{dx}=\frac{3}{4}-\frac{3}{100}x\left(t\right)$

$\left(3x-6\right)\left(5x-7\right)-15x^2+51x$

$x\left(\frac{-\sin\left(x\right)-x\cos\left(x\right)}{3x^2}\right)+\frac{\sin\left(x\right)}{3x}=\cos\left(x\right)$

$\left(2x\right)+\:3x\:-x$