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The value of  is

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Bihar Senior Secondary Teacher (Mathematics) Official Paper (Held On: 26 Aug, 2023 Shift 2)
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  4. More than one of the above
  5. None of the above

Answer (Detailed Solution Below)

Option 1 :
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Detailed Solution

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Explanation:

=  (∵ tan-1 x - tan-1y = tan-1)

= 

= 

=  (∵ tan-1 x + tan-1y = tan-1)

=  = tan-11 = 

(1) is correct

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