$\left(3x^3-2x^2+3x-2\right)+\left(-3x^2-2x-9\right)$

$15m^5n^2+35m^3n^3+45m^2n^5$

$-9\cdot\left(-6-4\right):\:\left(-2\right)\cdot4$

$\frac{dy}{dx}=\ln x^6$

$\lim_{x\to0}\left(\frac{\cos\left(x\right)-1}{3\left(x\right)^2\csc^2x}\right)$

$6n^2+5-6$

$-5ab^3+3ab^3-4ab^3+4ab^3$