Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) Iff(x) `= cos x – cos^2 x + cos^3 x – ... oo, then int f (x)dx` is equal to - - Sarthaks eConnect

If f(x) `= cos x – cos^2 x + cos^3 x – ... oo, then int f (x)dx` is equal to -

`tan(x/2)+c`

`x-tan(x/2)+c`

`x-1/2tan(x/2)+c`

`(x-tan(x/2))/2+c`