$3x^2+15x-42=0$

$\frac{3\left(q^5\right)^4}{5q^4}$

$\int\left(1-x^2\right)^2\:\cdot\sqrt{x}$

$\left(2x\right)^3\:$

$\lim_{x\to0}\left(\frac{\sin\left(3x^2\right)}{\ln\left(\cos\left(2x^2-x\right)\right)}\right)$

$\frac{y}{dx}-\frac{x}{dy}=0$

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