Question
Find the interval in which function f(x) = sinx+cosx, 0 ≤ x ≤ 2π is decreasing
Options :
(-π/4, π/4)
(-π/4, 5π/4)
(π/4, -5π/4)
(π/4, 5π/4)
Answer :
(π/4, 5π/4)
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