$\lim_{x\to+0}\frac{\sin\left(x\right)}{x}$
$\left(2a+5b\right)\left(2a-5b\right)$
$\frac{dy}{dx}=y-\frac{4}{y^2}$
$\int94x^2sinxdx$
$6x+4-x-5x+2$
$12\cdot200-400-8+560$
$-\frac{12}{10}yx+\frac{1}{6}xy$
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