Consider the function f(x) = sin(x) in the interval [π/4, 7π/4]. The number and location(s) of the local minima of this function are
(A)
One, at π/2
(B)
One, at 3π/2
(C)
Two, at π/2 and 3π/2
(D)
Two, at π/4 and 3π/2
Answer: (D)
Explanation:
Sine function increases till π/2 and so for the considered interval π/4 would be a local minimum. From π/2, value of sine keeps on decreasing till 3π/2 and hence 3π/2 would be another local minima.
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