Question

Задание на картинке

Answer 1

$f(x)=4 \sqrt{3} ctg( \frac{x}{3} )$
$f( \frac{\pi}{2} )=4 \sqrt{3} *ctg( \frac{ \frac{\pi}{2} }{3} )= 4 \sqrt{3}* ctg( \frac{\pi}{6} )= 4 \sqrt{3}* \frac{cos( \frac{\pi}{6} )}{sin( \frac{\pi}{6} )} =$
$=4 \sqrt{3}* \frac{ \frac{ \sqrt{3} }{2} }{\frac{1}{2}} =4 \sqrt{3}* \sqrt{3} =4*3=12$