$\int_2^8a\left(x+3\right)dx$
$a^2+2a^2\left(a+b\right)+\left(a+b\right)$
$-11-\left(-3\right)$
$2x^2+16x+32$
$8-8+7b+7b$
$\int\frac{x^3+x^2+x+2}{x^4+x^2}dx$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{1+9secx}{1+9tanx}\right)$
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