$4g\:+\:5g$

$4\sin\left(x\right)+2\sqrt{3}=0$

$\frac{9}{4}a^6b^4+\frac{4}{9}a^2b^2z^6+2a^4b^3z^3$

$\left(x+8\right)\cdot\left(x-6\right)+\left(x+4\right)^2$

$\int_{-\frac{x}{4}}^{\frac{x}{6}}\left(-\sec\left(x\right)\tan\left(x\right)\right)dx$

$\frac{d}{dx}\left(-31=-8y^2-3y+x^2+9x\right)$