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