г) 3 tg π/4 - sin² π/3 + cos² π/6

tg π/4 = 1, sin² π/3 = (sqrt(3)/2)² = 3/4, cos² π/6 = (sqrt(3)/2)² = 3/4. Ответ: 3*1 - 3/4 + 3/4 = 3.