Trigonometry (Quiz)

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Q.1 $tan^{-1}\left (\frac{1}{4} \right ) + tan^{-1}\left (\frac{2}{9} \right )$ is equal to
  $\frac{1}{2}cos^{-1}\left (\frac{3}{5} \right )$
  $\frac{1}{2}sin^{-1}\left (\frac{3}{5} \right )$
  $\frac{1}{2}tan^{-1}\left (\frac{3}{5} \right )$
  $tan^{-1}\left (\frac{1}{2} \right )$