A) (19x⁻¹)' = -19x⁻²
б) (4^x³)' = 4^x³ln4*3x²
в) ((2/3*e^x/4)' = 2/3*1/4*e^x/4 = 3/2*e^x/4
г) (-2Cos14x)' = 28Sin14x
ж)(7ln(x/21))' = 7/x*21 * 1/21= 7/x
i) (√(8 + 3x)' = 1/(2√(8 + 3x) ) * 3 = 3/(2√(8 +3х))
к) (7/(6 - 4х²)³ )' = ( 7(6 - 4х²)⁻³)' = -21(6 - 4x²)⁻⁴ * (-8x) = 168x/(6 - 4x²)⁴