$\lim_{x\to0}\left(\frac{e^{-3x^3}-1+3x^3-\frac{9}{2}x^6}{7x^9}\right)$

$y^'-xy=0$

$\left(-4+3i\right)-\left(2+4i\right)$

$\frac{d^3}{dx^3}\left(\sin^2\left(x\right)\right)$

$x\frac{dy}{dx}-2y=\ln\left(3x\right)$

$\sin\left(x\right)\cdot\left(\sin\left(x\right)+\cos\left(x\right)\right)$

$b-1-8$