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0 votes
4.1k views
in Sets, relations and functions by (53.1k points)

The range of f(x) = cos2x - sin2x in contains the set

(A)   [2, 4]

(B)   [-1, 1]

(C)   [-2, 2]

(D)   [-4, 4]

1 Answer

+1 vote
by (53.3k points)
selected by
 
Best answer

Correct option   (B) [-1, 1]

Explanation :

We have

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