Cos X X Sinx
1. Stating the problem: Solve the equation $$\cos(x) - x \sin(x) = 0$$ for $x$.
2. Rearrange the equation:
$$\cos(x) = x \sin(x)$$
3. Divide both sides by $\cos(x)$, assuming $\cos(x) \neq 0$:
$$1 = x \tan(x)$$
which gives
$$x \tan(x) = 1$$
4. We need to find $x$ such that
$$x \tan(x) = 1$$.
5. This transcendental equation cannot be solved exactly by elementary methods, so we consider approximate solutions.
6. Check for obvious solutions:
- At $x=0$, $x \tan(x) = 0$ which is not equal to 1.
- For small positive $x$, $\tan(x) \approx x$, so $x \tan(x) \approx x^2$ which is less than 1 for small $x$.
7. By numerical methods or graphing, we find the first positive root near $x \approx 0.86$.
8. Also consider negative values: $x \tan(x)$ is odd function, so negative root near $x \approx -0.86$.
9. Conclusion: The solutions to the original equation are approximately
$$x \approx \pm 0.86$$.
These can be found more precisely using numerical solvers.