Maxima and MinimaMedium

Question

Let f(x) = , x ∈ (0, π), then f(x) -

Options

A.is monotonic decreasing in x ∈
B.is monotonic increasing in x ∈
C.has a local maxima at x = α given by cot α = - α
D.has a local minima at x = α given by cot α = - α

Solution

f′(x) =


cot α = - α

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