$7a\:-\:\:1,8\:b\:+\:5\:c\:-\:7,2a\:+\:5a\:-\:6,1b\:-\:8a\:+\:12b\:\:$

$\int\frac{\left(sinh\left(3x\right)\right)}{\sqrt{cosh^2\left(3x\right)+4}}dx$

$\frac{dy}{dx}+25y=0$

$\frac{x^2-4x+4}{x^2-x-12}$

$-\left(+6\right)-\left(-2\right)$

$\sqrt[m]{3}-\left(6m-4\right)x^{2m-9}-\left(m-1\right)x^{4m-21}$

$\frac{2}{\cot x+\tan x}=\sin\left(2\right)x$