\(\tan^{-1}\left (\cot \dfrac {3\pi}{4}\right)\) चे मुख्य मूल्य काढा:

1
\(-\dfrac {3\pi}{4}\)
2
\(\dfrac {3\pi}{4}\)
3
\(-\dfrac {\pi}{4}\)
4
\(\dfrac {\pi}{4}\)

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