Keaton Good

2022-01-27

I can verify that 0 is the solution of equation. But i don't have any method to show that is the only solution.

spelkw

Beginner2022-01-28Added 12 answers

HINT

Let indicate

$f\left(x\right)=\mathrm{sin}x-x\mathrm{cos}x-{\frac{12}{x}}^{2}\Rightarrow {f}^{\prime}\left(x\right)=x\mathrm{sin}x-x=x(\mathrm{sin}x-1)$

Let indicate