Question

Find the intervals in which the function f given by f(x) = sin x + cos x, 0 ≤ x ≤ 2π, is strictly increasing or strictly decreasing. 

Answer 1

For the critical points of the function over the interval v 0 ≤ x ≤ 2π is given by

Given function f(x)=sinx+cosx [0 ,2π ] =is strictly increasing