If $\tan \alpha$ equals the integral solution of the inequality $4x^2 - 16x + 15 < 0$ and $\cos \beta$ equals the slope of the bisector of the first quadrant,then $\sin(\alpha + \beta)\sin(\alpha - \beta)$ is equal to

  • A
    $\frac{3}{5}$
  • B
    $-\frac{3}{5}$
  • C
    $\frac{2}{\sqrt{5}}$
  • D
    $\frac{4}{5}$

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