Application of Derivatives 4 Question 23

####24. The number of values of x, where the function f(x)=cos⁡x+cos⁡(2x) attains its maximum, is(1998, 2M)

(a) 0

(b) 1

(c) 2

(d) infinite

Show Answer

Answer:

Correct Answer: 24. (a)

Solution:

  1. The maximum value of f(x)=cos⁡x+cos⁡(2x) is 2 which occurs at x=0. Also, there is no other value of x for which this value will be attained again.
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