The function \[f:R\to R\] is defined by \[f\left( x \right)={{\cos }^{2}}x+{{\sin }^{4}}x\] for \[x\in R\]. Then the range of \[f(x)\]is

\[\left( \frac{3}{4},1 \right)\]

\[\left( \frac{3}{4},1 \right]\]

\[\left[ \frac{3}{4},1 \right)\]

\[\left[ \frac{3}{4},1 \right]\]

The function \[f:R\to R\] is defined by \[f\left( x \right)={{\cos }^{

1.	The function \[f:R\to R\] is defined by \[f\left( x \right)={{\cos }^{2}}x+{{\sin }^{4}}x\] for \[x\in R\]. Then the range of \[f(x)\]is
A.	\[\left( \frac{3}{4},1 \right]\]
B.	\[\left[ \frac{3}{4},1 \right)\]
C.	\[\left[ \frac{3}{4},1 \right]\]
D.	\[\left( \frac{3}{4},1 \right)\]
Answer» D. \[\left( \frac{3}{4},1 \right)\]

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The function \[f:R\to R\] is defined by \[f\left( x \right)={{\cos }^{2}}x+{{\sin }^{4}}x\] for \[x\in R\]. Then the range of \[f(x)\]is

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