Can be a convergent equation (Term that I invent) like this example:

Find x in the equation:

X(cos(X)) = C

when C [Constant] = 3.

I use the calculator and choose x (x is in degree not Radians) the value 4.

4(cos(4)) = 3.99...

I need to decrease the value to find X.

Let x be 3:

3(cos(3)) = 2.99...

So the x is between 3 to 4.

You can continue to find x in that way by increasing and decreasing the value of X by calculator.

And Also:

You can choose any number of the equation:

X(cos(x)) = C

with different value of C.

Can you give memore examplesof this phenomenon?

Is there a reason to this phenomenon?

Why it happen?