If `y=(1+t a n A)(1-t a n B),`where `A-B=pi/4,`then `(y+1)^(y-1)`is eq – InterviewSolution

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1.	If `y=(1+t a n A)(1-t a n B),`where `A-B=pi/4,`then `(y+1)^(y-1)`is equal to9 (b) 4(c) 27 (d) 81A. 9B. 4C. 27D. 81
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