$\frac{\left(x+1\right)\left(x+2\right)}{\left(x-1\right)\left(x-2\right)}$

$3cos\left(x\right)-2cos^2\left(x\right)-1=0$

$\lim_{x\to0}\left(x^{-2}ln\left(1-x\right)\right)$

$3\left(-4+1\right)^2-8$

$\left(y^2+4\right)\left(y^2+7\right)$

$\int\left(2\right)\tan\left(6x-5\right)dx$

$\int\frac{1}{\sec\left(x\right)\left(1+cos\left(m\right)\right)}dx$