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in Sets, relations and functions by (53.1k points)
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The range of f (x) = sec(π/4 cos2 x), -∞ < x < is

(A)   (1,√2)

(B)   (1,∞)

(C)  [-√2,-1] ∪(1, √2)

(D)  (−∞ −1) ∪(1, ∞)

1 Answer

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by (53.3k points)
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Best answer

Correct option  (A)   [1,2]

Explanation :

Here,

   

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