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 \[=\left\{ 1 \right\}.\]
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