Question

-18√3 tg 390 градусов

Answer 1

$-18 sqrt{3} tg390 ^{o} =-18 sqrt{3}tg(360 ^{o} +30 ^{o} )=-18 sqrt{3}tg30 ^{o} =$

$=-18 sqrt{3}* frac{1}{ sqrt{3} } =-18.$