ЕР Екатерина Рудакова f'(x) = (2sin^2(x))' * cos(x) + 2sin^2(x) * (cos(x))' = 4sin(x)cos^2(x) - 2sin^3(x) f'(p/2) = 4sin(p/2)cos^2(p/2) - 2sin^3(p/2) = 0 - 2 = -2