Find the interval in which function f(x) = sinx+cosx, 0 ≤ x ≤ 2π is decreasing.

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answerhappygod
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Find the interval in which function f(x) = sinx+cosx, 0 ≤ x ≤ 2π is decreasing.

Post by answerhappygod »

a) (π/4, 5π/4)
b) (-π/4, 5π/4)
c) (π/4, -5π/4)
d) (-π/4, π/4)
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