$\left(18r^2+36r^4+27r^3\right)-\left(9r\right)$

$\frac{dy}{dx}\left(3x^{-4}-5x^{-1}=y\right)$

$\int\left(\frac{t}{1-x^5}\right)dt$

$\left(\frac{-48ab^1}{-6a^3b^5}\right)^{-1}$

$\sec\left(x\right)^2-\sec\left(x\right)^2\csc\left(x\right)^2$

$3-\frac{18-6}{4}$

$\frac{\csc\left(\theta\right)}{sec\left(\theta\right)}+\frac{cos\left(\theta\right)}{sin\left(\theta\right)}=\frac{x}{tan\left(\theta\right)}$