MATLAB: How to present this function in matlab to see the output signal

eveneven-odd-periodic-aperiodicMATLAB

the matlab code of:

and it is periodic or aperiodic?

and it is even or odd?

syms x(t)
x(t) = cos(10*pi*t)
fplot(x(t))
 
syms x(n)
x(n) = 1+2*n-3*n^2
figure
fplot(x(n))

You have not defined n and x as symbolic.

syms n x
f = symsum((1/(2*n-1))*sin((2*n-1)*2*x), n, 1, 5)

Variable of summation is 'i'. Try this code

function y = my_sin(x,n)
    syms I
    y=symsum((-1^I)*x^(2*I+1)/factorial(2*I+1),I,0,n);
end

Run it like this

>> my_sin(1, 2)
ans =
-47/40