Find the intervals of increase and decrease for the given function. f (x) = x3- 12x - 1 O f (x) is increasing for x 2; f (x) is decreasing for -2 6; f (x) is decreasing for x 6. O f (x) is increasing for -2 2.Find the intervals of increase and decrease for the given function. f (t) = - t ( 1 + 3 ) 2 O f (t) is increasing on t 3; f (t) is decreasing on -3 3; f (t) is decreasing on -3 3. O f (t) is increasing on -3 3