Question

find absolute extrema of y=cosx-x on [0,2pi]

Answer 1

What is an absolute extrema?

Answer 2

1.Compute the general first derivative.

2
Set the first derivative equal to zero and solve.


3
Compute the general second derivative.

4
Plug in the x values where the first derivative is 0 in the second derivative function.

if the value is -ve than it is maxima and it is +ve than it is minima