$1.1063-22.8472$

$\frac{d^2}{dx^2}\left(x\cdot\cos\left(x\right)\right)4x^2-6x+2$

$\lim_{x\to\frac{\pi}{2}}\left(\cot\left(x\right)^{x-\frac{\pi}{2}}\right)$

$\int x\left(ln\left(3+x\right)\right)dx$

$\left(7x+8y\right)\left(7x-8y\right)$

$17n\left(n+1\right)$

$\left(\frac{2}{3}x+\frac{1}{2}y-4\right)+\left(\frac{1}{4}x-\frac{5}{6}y-\frac{1}{2}0\right)$