Question

Найти производную!!!!!!
$y = 2 tan( frac{x}{2} )$
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Answer 1

$y=2, tgfrac{x}{2}\\y'=2, frac{1}{cos^2frac{x}{2}}cdot (frac{x}{2})'=2cdot frac{1}{cos^2frac{x}{2}}cdot frac{1}{2}=frac{1}{cos^2frac{x}{2}}$