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The function sin^4 x + cos^4 x is increasing in the interval (a) [5π/8,3π/4] (b) [π/2,5π/8] (c) [π/4,π/2]

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The function sin4 x + cos4 x is increasing in the interval 

(a) [5π/8,3π/4]

(b) [π/2,5π/8]

(c) [π/4,π/2]

(d) [0,π/4]

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Answer is (c) [π/4,π/2]

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