$-x^2+13x+12$
$\frac{ln\left(x\right)}{\sqrt{y}}\cdot\:\frac{1}{dy}=x^3ln\left(y\right)\:.\left(\frac{1}{dx}\right)$
$4\:+\:-\left(-16\right)\:x\:2\:+\:\left(-45\right)$
$\left(ab^2+b-2c\right)^2$
$\int2x\left(x^2+4\right)dx$
$x^2-9x-20=0$
$\log_b\left(2x\right)$
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