Question

ПОМОГИТЕ С ПРОИЗВОДНОЙ
 

Answer 1

$y`=(-frac{1}{cos2x}+cosfrac{pi}{3})`=(-(cos2x)^{-1})`+(cosfrac{pi}{3})`=-2sin2xcos2x^{-2}=\=-frac{2sin2x}{cos^22x}=-2frac{tg2x}{cos2x}=-2frac{tgfrac{pi}{4}}{cosfrac{pi}{4}}=-2frac{2}{sqrt2}=-2sqrt2$