$-4\left(-6\right)\cdot\left(5-13\right)$

$2mx+6\left(b^2+c^2\right)\:-4d^2;\:a=3\:;b=4\:;c=\frac{1}{3}\:;d=\frac{1}{2}\:;m=\frac{1}{2}$

$\left(sec\:\theta\:-tan\theta\:\right)\left(csc\theta\:+1\right)$

$r\:+\:16\:=\:8$

$\left(x+1\right)\left(x-6\right)\left(x-31\right)$

$10x^2+3x-4$

$xy'+y=\left(x+1\right)^2$