$\int_{\frac{\pi}{-4}}^{\frac{\pi}{6}}\left(-\sec\left(x\right)\tan\left(x\right)\right)dx$

$\log_{30}\left(c-1\right)+\log_{30}\left(c-8\right)=1$

$\:\frac{\left(n^2\right)}{9}+2mn+9n^2$

$\lim_{z\to k}\left(\frac{\pi\cot\left(\pi z\right)}{z^2}\right)$

$\frac{1-\cos\left(4x\right)}{\cos\left(2x\right)-\cos\left(6x\right)}$

$2x^2+4x+3$

$3p^3+3pq^2+2p^2\:q+2q^3$