Найдите значение выражения 2sqrt(3)cos^2 13Pi/4 - sqrt(3)
2sqrt(3)cos^2 (13π/4) - sqrt(3) = A cos (13π/4) = cos (3π + π/4) = cos (π + π/4) = -cos (π/4) = -1/sqrt(2) cos^2 (13π/4) = (-1/sqrt(2))^2 = 1/2 A = 2sqrt(3)cos^2 (13π/4) - sqrt(3) = 2sqrt(3)*1/2 - sqrt(3) = sqrt(3) - sqrt(3) = 0