plot function in matlab

main.m
        1. Define the function as a symbolic expression or anonymous function.
        For example, to define the function `f(x) = sin(x) + cos(x)` as a symbolic expression:
        ```
        syms x
        f = sin(x) + cos(x)
        ```
        Or, to define the function as an anonymous function:
        ```
        f = @(x) sin(x) + cos(x)
        ```

        2. Use `ezplot` to generate a plot of the function.
        For example, to plot the function over the interval [-pi, pi]:
        ```
        ezplot(f, [-pi, pi])
        ```
        You can also add a title and axis labels to the plot using the `title`, `xlabel`, and `ylabel` functions.

        Here's the complete code:
        ```
        syms x
        f = sin(x) + cos(x)
        ezplot(f, [-pi, pi])
        title('Plot of sin(x) + cos(x)')
        xlabel('x')
        ylabel('f(x)')
        ```
        This will generate a plot of the function `f(x) = sin(x) + cos(x)` over the interval [-pi, pi], with a title and axis labels.
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