Value of `(1+tan 13)(1+tan 32)+(1+tan 12)(1+tan 33) =`

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

The value of (tan 47^(@) + tan 43^(@))/(1-tan 47^(@) tan 43^(@)) is

The value of (tan 1^(@) tan 2^(@) tan 3^(@) … tan 89^(@) ) is

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

The value of tan^(-1)tan(-6) is

((1+tan13^(@))(1+tan32^(@)))/((1+tan12^(@))(1+tan33^(@))))=

The value of ((1+tan11^(@))(1+tan34^(@)))/((1+tan17^(@))(1+tan28^(@))) is

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