$\frac{d}{dx}\sqrt{4-7x}$

$\frac{\left(-3a^2b^3\right)^2}{\left(-2ab^4\right)^3}$

$0.1817588727-\left(\frac{\left(-0.9999999606\right)\left(1.3-0.1817588725\right)}{12.78584918-\left(-0.9999999999\right)}\right)$

$36x^2+49x+72$

$\frac{x^2+6x+3}{x-1}$

$\left(3-x\right)^2\left(2-x\right)$

$xdx+e^{3x}dy=0$