you missed solutions when you divided by , note that the correct procedure is to factor ...
also, note that the solution interval is to , so the negative solutions are not needed.
i'd like your thoughts on this one. thank you!
Find the intervals on which f is increasing/decreasing and state any relative extremaSo I find the derivative to find the critical numbers:1)
So I set that equal to zero:
Divide by -2:
Add :
Sub :
Divide by :
So:
So I went on the unit circle and found all the places where the x coordinate is one half and included the negative of those angles angles since
Based on that I got
Is this right so far?