$\left(2b+3+b\right)\left(1b+3+2b\right)$
$\lim_{x\to0}\frac{11x^2}{cos\left(x\right)-1}$
$\frac{22}{7}-\frac{15}{7}$
$12-6+8-\left(-8\right)$
$-6+5+6+8+7+1+9+7$
$\int\frac{4x^3-6x^5+7-8x}{x^2}dx$
$\int_0^{60}\left(105e^{-0.04t}\right)dt$
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