1.

Prove that `(1+tan1^(@))(1+tan2^(@))....(1+tan4 5^(@))=2^(23)`A. `2^(21)`B. `2^(22)`C. `2^(23)`D. `2^(25)`

Answer» Correct Answer - C
`(1+tantheta)(1+tan(45-theta)) = (1+tantheta) (1+(1-tantheta)/(1+tantheta)) = 2`
`(1+tan1^(@))(1+tan44^(@)) = 2 etc`
so product `= 2^(22) (1+tan45^(@)) = 2^(23)`


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