What is the number of critical points of f(x)=max(sinx,cosx) in the intervasl (-2π,2π)?
What is the number of critical points of f(x)=max(sinx,cosx) in the intervasl (-2π,2π)?
Amit , 9 Years ago
Grade 10
Differential Calculus> What is the number of critical points of ...
1 AnswersAjay
First you need to draw graph for max (sinx, cosx ) as follows
Draw combined graphs of both sinx and cos x so that at some places graph of sin x will be higher and at other cosx will higher.
Take only the higher portion of graph and mark it bold. This will give you the graph of f(x)=max(sinx,cosx).
Critical points are points on graph where the derivative is 0 or undefined.
Now you can easily check the points which are high or low (critical points). The number of such points comes out to be 7
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