$\log_{x+2}\left(x^2\right)$

$3x\left(4\right)+6x\left(2\right)-9x\left(5\right)+11x-12x\left(2\right)-1$

$\left(m-5\right)\left(m+7\right)$

$\int\frac{x^2+20x-7}{\left(x^2+1\right)\left(4x^2+9\right)}dx$

$\int\frac{e^{4t}}{\left(e^{2t}-1\right)^3}dt$

$\int\cos\left(16-8x\right)dx$

$\left(121x\right)^2-\left(81y\right)^2$