How do you find the intervals of increasing and decreasing using the first derivative given y=sinx+cosxy=sinx+cosx?
1 Answer
The function is increasing on intervals of the form
Explanation:
The derivative of
You can check that
You can check that
The answer above follows from these observations.
You can confirm this visually by looking at the graph.
graph{sin(x)+cos(x) [-10, 10, -5, 5]}