Continuity and DifferentiabilityHard

Question

If , then ƒ′(x) is equals to -

Options

A.− (cosx + sinx), for x ∈ (π/4, π/2)
B.(cos x + sin x), for x ∈ (0, π / 4)
C.− (cos x + sin x), for x ∈ (0, π / 4)
D.cos x − sin x, for x ∈ (π / 4, π / 2)

Solution

-

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