\leq\frac{x^2}{x^2+y^2+z^2}\left|\frac{\sin x^2}{x^2}-1\right|+\frac{y^2}{x^2+y^2+z^2}\left|\frac{\sin y^2}{y^2}-1\right|+\frac{z^2}{x^2+y^2+z^2}\left|\frac{\sin z^2}{z^2}-1\right|\leq