$2\left(1\right)^4+\:\left(1\right)^3+\:15\left(1\right)^2+\:9\left(1\right)\:-\:27$

$x-1+\left(x^2+2x\right)e^{-x}$

$\frac{d^2}{dx^2}\left(z^{y^x}\right)$

$\left(d-9\right)\left(d-16\right)$

$12-3x>18x+5$

$\left(\tan+\cot\right)^2$

$\int\left(\sqrt{\sec\left(x\right)^2-4}\cdot\cos\left(x\right)\cdot\sin\left(x\right)\right)$