Test Academy | Find the interval in which function f(x) = sinx+cosx is increasing (5π/4, 2π), [0, π/4) and (5π/4, 2π], (π/4, -5π/4), (-π/4, π/4)

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)

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