alleryOn which interval is f(x) = cos x strictly decreasing?
A(π, 2π)
B(0, π)
C(−π, 0)
D(3π/2, 2π)
Answer & Solution
Correct answer: B. (0, π)
f'(x) = −sin x is negative whenever sin x > 0, which holds on (0, π).
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