Calculator app crashes when trying to plot 'x < sin(x)'

[ghost]

Describe the Bug: The Calculator app crashes when we try to plot the inequality 'x < sin(x)'.

Steps to Reproduce:

1. Open the Calculator in Graphing mode.
2. Type 'x' as the first expression.
3. Type 'x^2' as the second expression.
4. Type 'x < sin(x)' as the third expression and press Enter.

5. You will notice that the Calculator app crashes.

Note: The Calculator app is currently unable to plot inequalities of the type:

x < sin (x)
sin(x) < cos (x)
cos(x) < sin(x)

Expected Behaviour: The Calculator should readily plot these inequalities and should not crash while handling them.

Requested Assignment: I'm just reporting this problem. I don't want to fix it.

[MicrosoftIssueBot]

This is your friendly Microsoft Issue Bot. I've seen this issue come in and have gone to tell a human about it.

[ghost]

Here is how Microsoft Math Solver plots sin(x) < cos(x):

[grochocki]

For sin(x) < cos(x), I get this:

I get error messages for the others, but no crash:

[ghost]

@grochocki Are you sure you followed the steps exactly as I told above? The crash definitely occurs.

You didn't enter x and x^2 before x < sin(x) as I did above.

[ghost]

For sin(x) < cos(x), I get this:

I get error messages for the others, but no crash:

@grochocki For this inequality, the Calculator mostly shows 'This equation could not be graphed'.

And for cos(x) < sin(x), the calculator either displays a blank graph or displays the same error as for sin(x) < cos(x).

[ghost]

Note that my input was x < sin x.

[grochocki]

Right you are! Thanks for the additional information.

[ghost]

@grochocki x < sin(x) is indeed too complex to be plotted by a graphing calculator. For plotting this inequality, we have to find all possible values of x for which it is less than its function i.e. sin(x). For example (-0.1) < sin(-0.1).

But inequalities like sin(x) < cos(x) and cos(x) < sin(x) are standard inequalities taught in trigonometry at the high school level. These ought to be handled properly by a graphing calculator.

[onlymx13]

Isn't x < sin(x) just the same as x < 0?