$\cos^2\left(x\right)+3\sin\left(x\right)+1$
$\frac{b^2+b-5}{b+3}$
$x\frac{dv}{dx}=\frac{-1+v^3}{3v^2}$
$\frac{\tan\left(x\right)}{\csc\left(x\right)+\cot\left(x\right)}$
$8x+15+6a+6\:$
$\lim_{x\to+\infty}\left(-\frac{e^x+1}{x-e^x}\right)$
$113-7029$
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