$16u^2+16u+4$

$\left(9xy^2+7w^4\right)\left(9xy^2-7w^4\right)$

$\left(w-2\right)\left(w+6\right)$

$\cos a=\csc a.\tan a.\cos^2a$

$10-\left|\left(-2\right).\left(-6\right)\right|+2-0.\left(-6\right)$

$\lim_{x\to0}\left(\frac{4x+5tan\left(x\right)}{2sin\left(x\right)-3x}\right)$

$\left(4x^2-3x-1\right)\left(2x-5\right)$