$-9+8-1+4+3-2-9$

$\left(x+5\right)\left(x+2\right)\left(x+1\right)\left(x-2\right)$

$\frac{dx}{dy}=\left(2-x\right)\left(1-x\right)$

$\cos\left(21\right)\cos\left(59\right)-\sin\left(21\right)\cos\left(59\right)$

$\left(-1\right)^{14}$

$\int11z^3e^zdz$

$x^2-10x-171=0$