$c^2-10c+24$

$\left(x^3+3x^4-2x^5+6x^2-3x+4\right)-\left(-x^3+3x+4\right)$

$\cot^2y\left(\sec^2y-1\right)=1$

$\lim_{x\to-1}\left(\frac{x^2-4x}{x^2-3x-4}\:\:\:\right)$

$x^2+10x=-21$

$\left(x-7\right)\:\cdot\left(x-11\right)\:+\:\left(x\:-\:11\right)\:\cdot\:\left(x\:+\:11\right)+\:\left(x\:+13\right)\:\cdot\left(x-3\right)$

$\int_3^{\infty}x^2\left(2x+5x^3\right)^1dx$