$-3x^2+36x-108$

$^{18}\sqrt{\frac{64a^6}{b^{12}}}$

$\int\left(\frac{3x^3}{\sqrt{8-9x^4}}\right)dx$

$30+6t=11t$

$\int_0^{\infty}\left(2x+y\right)dx$

$-x^3+3x^2-4$

$\frac{\sin\left(90+a\right)+\cos\left(180+a\right)\cdot\sin\left(-a\right)}{\sin\left(90\right)-\cos\left(90+a\right)}$