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Questions  

 Range of the function f(x)=log22log216sin2x+1 is : 

a
[0,1]
b
(−∞,1]
c
[−1,1]
d
(−∞,∞)

detailed solution

Correct option is B

f(x)=log2⁡2−2log2⁡16sin2⁡x+10≤log2⁡16sin2⁡x+1≤log2⁡17 ⇒2−2log2⁡17≤2−2log2⁡16sin2⁡x+1≤2⇒ 0<2−2log2⁡16sin2⁡x+1≤2⇒f(x)≤1

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