GATE 2018 Textile Engineering: Interval where sin x and cos x are Both Decreasing

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Textile Engineering > GATE 2018 > Trigonometry

For 0 ≤ x ≤ 2π, in which interval(s) are both sin x and cos x decreasing functions?

A

(0, π/2)

B

(π/2, π)

C

(π, 3π/2)

D

(3π/2, 2π)

Correct : b

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