$\left(n+3\right)\left(n-8\right)$

$y+7-2\left(y+4\right)$

$\int\frac{\sin\left(4x\right)}{\cos\left(4x\right)+5}dx$

$\cot\frac{\sin\left(a\right)}{\cos\left(a\right)}$

$13.2+13.6+13.7+14.0+14.1+14.6+14.9+15.0+16.0$

$x3+3x-x$

$\frac{dy}{dx}=\left(y+1\right)\left(y-4\right)$