$-3x^2\left(3x^6-2x^4+x^3-2x+3\right)$

$\left(\frac{x^4}{y^2}\right)^3$

$\lim_{y\to-9}\left(\frac{\left(\sqrt{81-y^2}\right)}{y+9}\right)$

$\int\left(6\sin x+9\cos x\right)dx$

$\cos^3x=-\cos x$

$\left(-5+3\right)^3+\left(1+3\right)^2$

$\frac{1}{12^{16}}\quad\delta\quad12^{16}\quad12^{-13}$