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Question

Solve:
2tan134tan11731

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Solution

2tan1(34)tan1(711)
tan1(34)+{tan1(34)tan1(711)}
=tan1(34)+tan1⎜ ⎜ ⎜347111+34.711⎟ ⎟ ⎟
=tan1(34)+tan1⎜ ⎜ ⎜33284444+2144⎟ ⎟ ⎟
=tan1(34)+tan1(565)
=tan1(34)+tan1(113)
=tan1⎜ ⎜ ⎜34+113134.113⎟ ⎟ ⎟
=tan1(4349)

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