$\left(3m^2+4\right)\left(3m^2-10\right)$

$\log\left(x\right)+\log\left(x^2-4\right)-\log\left(15\right)-\log\left(x+2\right)$

$\lim_{x\to\frac{\pi}{2}}\left(\frac{\cos\left(x\right)}{x^2}\right)$

$20\cdot2+19\cdot2+15\cdot2+40\cdot2+5\cdot2+14\cdot2$

$-2\left(x-1\right)\left(x+1\right)$

$\sec\left(x\right)^2+\csc\left(x\right)^2-1=\csc\left(x\right)^2$

$\lim\:_{x\to\:1}\left(4x^3+x^2+2x+1\right)$