$\int_0^4\left(\left(\frac{1}{\left(1+x\right)}\right)+\left(\frac{1}{\left(1+x^2\right)}\right)\right)dx$

$\frac{dy}{dx}=\frac{1}{6}\left(100-x\right)$

$208\cdot30$

$b^2+3+2b^2$

$\left(-1\right)^n\frac{7n+3}{n^2-n}\left(x-1\right)^n$

$-3+5\left(-4+2\right)-6-3\cdot\left(2-4\right)$

$\left(-87.765\right)\cdot\left(-85\right)$