$\mathop {\lim }\limits_{\alpha \to \beta } \left[ {\frac{{{{\sin }^2}\alpha - {{\sin }^2}\beta }}{{{\alpha ^2} - {\beta ^2}}}} \right] = $

  • A
    $0$
  • B
    $1$
  • C
    $\frac{{\sin \beta }}{\beta }$
  • D
    $\frac{{\sin 2\beta }}{{2\beta }}$

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