$\left(-5ab\right)\left(9ab\right)\left(-a^2b^3\right)$

$\frac{d}{dx}\left(\arcsin\left(4x^2\right)\right)^2.n$

$\frac{x^2-1}{\left(x+1\right)^2}$

$3\cos^2\left(x\right)-\cos\left(x\right)-2=0$

$y+25=30$

$\int2x\left(x^2-3\right)^4dx$

$\lim_{x\to\infty}\left(\frac{-e^x-2}{2x^3-7}\right)$