Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) If `f(x)=sin x-x`, then `int_(-2pi)^(2pi)|f^(-1)(x)|dx` equals - Sarthaks eConnect

If `f(x)=sin x-x`, then `int_(-2pi)^(2pi)|f^(-1)(x)|dx` equals

`pi^2`

`2pi^2`

`3pi^2`

`4pi^2`