$\lim_{x\to3}\left(\frac{x-4}{3-\sqrt{x-5}}\right)$

$\int x\left(3x^2-1\right)dx$

$784-\left\{5+\left[3-132:-2\right].7\right\}$

$\int\cos\left(\sqrt[4]{x-1}\right)dx$

$=sin^2x-3\left(1-sin^2x\right)$

$4\:.\:-88$

$9\left(x-y\right)^2-12\left(x-y\right)\left(x+y\right)+4\left(x+y\right)^2$