$\lim_{x\to0}\:\frac{1}{sinx}-\frac{1}{x^2}$
$5-3\left[4+2\left(5-8\right)\right]-\left|-6\right|$
$4\left(1-b\right)+\left(1-b\right)^2$
$2\left(a-b\right)+3c\left(a-b\right)$
$\frac{4ab^2}{3bc}$
$\int_1^3\left(4x+4\right)dx$
$\int\frac{12x+8}{x\left(x^2+9\right)}dx$
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