$38\cdot12$
$\frac{y-4}{y-2}dy=\frac{x+3}{x-2}dx$
$\frac{1}{16tan^2x\sqrt{16+16tan^2x}},\:x=4tanx$
$-\frac{2}{3}+4x\ge0$
$\lim_{x\to-2}\frac{x+2}{x-2}$
$\sqrt{1250}\cdot\sqrt{1250}$
$-\frac{1}{3}-\frac{5}{3}$
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