Range of the function $f(x) = {\sin ^2}({x^4}) + {\cos ^2}({x^4})$ is
Range of the function $f(x) = {\sin ^2}({x^4}) + {\cos ^2}({x^4})$ is
- A
$( - \infty ,\;\infty )$
- B
${1}$
- C
$(-1, 1)$
- D
$(0, 1)$
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