Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) The range of `f(x) = sin^-1 x + cos^-1 x + tan^-1 x` is - Sarthaks eConnect

The range of `f(x) = sin^-1 x + cos^-1 x + tan^-1 x` is

`(0, pi)`

`[pi/4, (3pi)/4]`

`[-pi/4, pi/4]`

`[0, (3pi)/4]`