f(x) = max. (sin x , cos x ) for all x belongs to R . Then number of critical points belongs to ( -2pi , 2pi ) is/ are(a) 5 (b) 4(c) 7 (d) none of these

from the figure , we can see that there are 4 critical points.

thus the number of critical points are 4.
hope this helps you

• -44
What are you looking for?