$4-4x^2+4x$

$3\sqrt[4]{z}\cdot\:3z^{\frac{3}{4}}$

$\int\cos\left(x-y\right)dx$

$\left(3x^2y'\right)\left(x+3\right)$

$sin\left(a\right)sin\left(b\right)=\frac{1}{2}\left(cos\left(a-b\right)-cos\left(a+b\right)\right)$

$\lim_{x\to\infty}\left(\frac{x+1}{-x+1}\right)^{4x}$

$3x^2-24x+36$