А) f(x)=(2x+3) ·√(x + 4) f'(x)= 2·√(x + 4) + (2x + 3)/(2√(x + 4)) =
= (6x + 19)/(2√(x + 4))
b) f(x)= 1/x² + 1 f'(x) = -2/x³
c) f(x)= (2x + 3)/(6x - 8) f'(x) = (2(6x - 8) - 6(2x + 3))/(4(3x - 4)²) =
= -17/(2(3x - 4)²)
d) y = - 3log₄x y = log₄ (1/x³) y' = -3/(x ln4)