$26x^2-30x+9$
$\int\frac{7}{sqrt\left(x^2+16\right)}dx$
$x2-3x+\frac{7}{x+3}$
$2arcsen\frac{x}{2}-\frac{1}{2}sen4x$
$\frac{dy}{dx}=\frac{\left(4y+3\right)^2}{\left(8x+9\right)^2}$
$\lim_{x\to-\infty}\frac{3x}{3x+xe^x}$
$k2-100$
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