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If A = sin^2 x + cos^4 x, then for all real x (a) 13/16 ≤ A ≤ 1 (b) 1 ≤ A ≤ 2 (c) 3/4 ≤ A ≤ 13/16 (d) 3/4 ≤ A ≤ 1

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If A = sin2 x + cos4 x, then for all real x

(a) 13/16 ≤ A ≤ 1

(b) 1 ≤ A ≤ 2

(c) 3/4 ≤ A ≤ 13/16

(d) 3/4 ≤ A ≤ 1

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1 Answer

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Best answer

The correct option is (d) 3/4 ≤ A ≤ 1.

Explanation:

A = sin2 x + cos4 x,

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