$\int e^{\sqrt{3s+9}}ds$

$3\cdot\left(12-19\right)+5\left(-18+16\right)-\left(-4\right)\left(-5\right)$

$2n^2+3n+1$

$\cos\left(\frac{\pi}{2}+x\right)=-\sin x$

$\int\frac{3x+2}{x^2+x}dx$

$\int\left(\frac{x^2}{\left(x+4\right)^5}\right)dx$

$5x^3-x^2+7-\left(2x^2+4x-1\right)$