$-9\:+\:1\:+\:0\:+\:2\:$

$\int_{-\pi}^{\pi}\left(2x+1\right)\left(\cos\left(nx\right)\right)dx$

$\frac{dy}{dx}=\frac{\sqrt{2}}{\left(2x+1\right)}$

$7.365-0.8\cdot1.6^2$

$1.find\:\:\left(-9\right)\:+7\:-\left(-3\right)$

$\frac{36}{4}-18$

$\int r^6\left(1+r^7\right)^5dx$