A) \[(-\infty ,\,\,\infty )\]
B) \[\{1\}\]
C) \[(-1,\,\,1)\]
D) \[(0,\,\,1)\]
Correct Answer: B
Solution :
\[f(x)={{\sin }^{2}}({{x}^{4}})+{{\cos }^{2}}({{x}^{4}})=1\] Hence, range\[=\{1\}\]
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