Derivative of symbolic funtion at a specific value

I have a symbolic function of variable "x"

Function = @(x) 8-4.5*(x-sin (x));

say I need to get the derivative at x=5

what should i do?

Answer 1

[Azzi Abdelmalek]

Function = @(x) 8-4.5*(x-sin (x)); 
Function(5)

%derivative

 Function_d = @(x) diff('8-4.5*(x-sin (x))');
 x=5; eval(Function_d(1))

[Ahmed Elkady]

Thanks for responding but I would like the First Derivative of this function at x=5;

[Azzi Abdelmalek]

 Function_d = @(x) diff('8-4.5*(x-sin (x))');
 Function_d(5)

[Ahmed Elkady]

Still not working, it gives the derivative as function of "x" but it doesn't evaluate at x=5

>> Function_d = @(x) diff('8-4.5*(x-sin (x))'); >> Function_d(5)

4.5*cos(x) - 4.5

[Azzi Abdelmalek]

try this

Function_d = @(x) diff('8-4.5*(x-sin (x))');
x=5; eval(Function_d(1))

Answer 2

[Ahmed Sheta]

syms x y=sin(x) a=diff(y,2,x) subs(a,x,pi/2)

[Mohammad Tauquir Iqbal]

Thanks.