Question

`tan^-1  1/2 + tan^-1  2/11` is equal to

विकल्प

• `tan^-1  4/3`

• `tan^-1  3/4`

• `tan  4/3`

• `tan  3/4`

Answer 1

`tan^-1  3/4`

Explanation:

`tan^-1  1/2 + tan^-1  2/11`

= `tan^-1  (1/2 + 2/11)/(1 - 1/2 xx 2/11)`

= `tan^-1  15/20`

= `tan^-1  3/4`

= R.H.S