хэлп
[tex] \lim_{x \to0} \frac{sin ^{3}x }{sin x^{3} } [/tex]

[tex]\displaystyle \lim_{x \to 0} \frac{\sin^3x}{\sinx^3} =\lim_{x \to 0} \frac{x^3}{x^3} =1[/tex]