A) f'(x) = 15x^2 - 24x^3 + 6x
f'(1) = 15 - 24 + 6 = -3
б) f'(x) =( (-1)*(2x+3) - 2*(1-x) ) / (2x+3)^2
f'(2) = ( -7 + 12 ) / 289 = -5/289
в) f'(x) = 2x*(x^3 - 2) + 3x^2*(x^2 + 1)
f'(1) = 2*(-2) + 3*2 = 2
г) f'(x) = 2*(sin5x) + 5*cos5x*2x
f'(п/2) = 2*1 + 5*0*0 = 2