inputing pi in syms

Hello,

I am working with the code bellow & R2020a.

The answer provided is:

result:

which is correct.

However, I would much prefare the answer to be given in the form:

aim:

Is there a way to do so?

So far I tried using

pi = sym('pi')

and

pi = sym(pi)

or just pi as a symbol.

In the best senario I get the number answer (389.6364); in the worst I obtain this:

Thank you,

The code used:

syms k x L E I 
pi = sym(pi)

% Trial function
w = k * (1- cos(2*pi*x/L))
% Derivatives
w_x  = diff(w,x,1)
w_xx = diff(w,x,2)
% x_y  = diff(w,y,1)
% x_yy = diff(w,y,2)

% Strain
U = 1/2* int((E*I*w_xx^2),[0,L])

[madhan ravi]

Why do you expect the sun part to disappear?

[Aleksander Tyczynski]

Because

[madhan ravi]

Yes but once you define pi using syms it doesn’t revalues the expression.

[Aleksander Tyczynski]

indeed that is the basis of my question.

Is there a way to obtain:

• a final answer with π
• and where π is 'understood' as 3.14... so eg. ends up being zero

Basically, can I obtain this:

[Surya Talluri]

I have checked with R2020a and the code that you have mentioned is working fine for me with sin(4pi) turning to zero.