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13. If y = (1 + tan A) (1 - tan B), wher...

13. If y = (1 + tan A) (1 - tan B), where `A -B=pi/4` then `(y+ 1)^(y + 1)` is equal to

A

9

B

4

C

27

D

81

Text Solution

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The correct Answer is:
C
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