$\frac{5x^n}{3^n}$

$\frac{\cos\left(-x\right)}{\csc\left(x\right)-\sin\left(x\right)}$

$\frac{dx}{dt}=3x$

$\left(1+x^2\right)\frac{dy}{dx}=y^2$

$-42\:+\:3\:-\:-2$

$\left(x-2\right)^2\:+\:\left(x-3\right)^2\le2\left(x-1\right)^2$

$\left(5x^4+8\right)+\left(-5+3x^4-2x^3\right)$