A) [2, 4]
B) [?1, 1]
C) [?2, 2]
D) [?4, 4]
Correct Answer: B
Solution :
\[f(x)=\sqrt{2}\,\left[ \sin \left( \frac{\pi }{4}-2x \right) \right]\] \[\therefore \,\,-\sqrt{2}\le f(x)\le \sqrt{2}\] and \[[-1,\,\,1]\,\subset \,[-\sqrt{2},\sqrt{2}]\].
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