$4\left(a-b\right)^2$

$64x\left(2\right)-48xy+8y\left(2\right)$

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

$6b+a+4b+5+5a$

$-7\cdot\left(-2\right)$

$y',\:\frac{\sqrt{1-9x}\left(x^2+8\right)^2}{x^2+7x+2}$

$\lim_{x\to\frac{\pi}{2}}\left(\frac{\left(2x-\pi\right)cox}{x\left(1-sinx\right)}\right)$