Question

ПОМОГИТЕ С НОМЕРОМ 351! СРОЧНО!

Answer 1

$frac{2tgfrac{pi}{8}}{1-tg^2frac{pi}{8}}=tgfrac{pi}{4}=1\\frac{6tg15^0}{1-tg^215^0}=3tg30^0=3frac{1}{sqrt3}=sqrt3\\frac{4tg75^0}{1-tg^275^0}=2tg150^0=2tg(180^0-30^0)=2(-tg30^0)=frac{-2}{sqrt3}$