MATLAB: Differentiation of the equation

Question

here is an equation how to differentiate 'y' from that in live script

i tried diff() but it is not working.

y=@(x) (-0.6*x^2+2.4*x+5.5)

Answer 1

Analytical expression for derivative of 'y' is only possible through the Symbolic toolbox

syms x
y = -0.6*x^2+2.4*x+5.5;
dy = diff(y)

Result

>> dy
dy =
12/5 - (6*x)/5