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Find the intervals in which the function f given by f(x)=sinx + cosx ,o_x_2pi is strictly increasing or strictly decreasing
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Find the intervals in which the function f given by

f(x)=sinx + cosx ,o_x_2pi is strictly increasing or strictly decreasing

User Sabin Chacko
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The function f(x) = sinx + cosx is strictly increasing on the interval [0, π/4) ∪ (5π/4, 2π] and is strictly decreasing on the interval (π/4, 5π/4).
User Simon Schubert
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