Sgrt3= 3^1/2; 3 sgrt3 = 3^1 * 3^1/2 = 3^3/2; ⇒ 3^(1/2 * tgx) = 3^(3/2) / 3^tgx ; 3^(tgx /2) = 3^(3/2 - tgx); tgx /2 = 3/2 - tgx; tgx/2 + tg x = 3/2; 3/2 * tg x = 3/2; tg x = 1; x = pi/4 + pi*k ; k-Z