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Dear Vivek
Here you have to make pairs such that sum of angle is 45 like (1+tan1)(1+tan44) and (1+tan2)(1+tan43) etc there will be 22 pairs like this and one single term 1+tan45 which is equal to two
you have to apply sin(90-A)=cosA etc
now see the pic for solution
All the best.
AKASH GOYAL
AskiitiansExpert-IITD
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