If the value of
`(1+tan 1^(@))(1+ tan 2^(@)) (1+tan 3^(@))`………. Is `2^(lambda)`, then the sum of the digits of the number `lambda` is

If the value of (1+tan 1^(@))(1+ tan 2^(@)) (1+tan 3^(@)) ……….(1+ tan 45) Is 2^(lambda) , then the sum of the digits of the number lambda is

The value of (1+tan^2A)/(1-tan^2A) is

The value of tan^-1 2 + tan^-1 3 is

The value of (tan^(-1) ((1)/(2)) + tan^(-1) ((1)/(3)))=

The value of tan^(-1)1+tan^(-1)2+tan^(-1)3 is

The value of tan^-1 1+tan^-1 2+ tan^-1 3 is

The value of tan^(-1)1+tan^(-1)2+tan^(-1)3 is