$\left(-2c^5d^3\right)\left(c^4d^6\right)^2$

$\csc\left(x+\frac{\pi}{3}\right)=2$

$\lim_{x\to0}\left(\frac{x^2}{\sin^2\left(x\right)}\right)$

$\left(5a-3b+m\right)-\left(-a-2b+3n\right)$

$1\frac{1}{z^2}$

$\lim_{x\to\frac{\pi}{2}}\left(4cos\left(-7x\right)sec\left(3x\right)\right)$

$tan^2\theta\:\left(cot^2\theta\:-cos^2\theta\:\right)$