$\frac{-14x-51}{-4x-21}$

$cot\left(0.6\right)\cdot csc\left(0.6\right)\:$

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

$\frac{\left(1+0.01875\right)^{10}-1}{0.01875}$

$\left(x^5\:-\:6\right).\:\:\left(\:x^5\:+\:6\right)\:\:$

$\left(-\frac{1}{3}xy^2\right)\left(3x^2+\frac{5}{2}x-1\right)$

$\left(2x^3+12\right)\left(2x^3-4\right)$