If $\tan A$ and $\tan B$ are the roots of the quadratic equation $x^2-px+q=0$,then $\sin^2(A+B)$ is equal to

  • A
    $\frac{p^2}{p^2+q^2}$
  • B
    $\frac{p^2}{(p+q)^2}$
  • C
    $1-\frac{p}{(1-q)^2}$
  • D
    $\frac{p^2}{p^2+(1-q)^2}$

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