As $x$ ranges over all real numbers, find the range of
\[f(x) = \sin^4 x + \cos ^2 x.\]Enter your answer using interval notation.
Question:
As $x$ ranges over all real numbers, find the range of
\[f(x) = \sin^4 x + \cos ^2 x.\]Enter your answer using interval notation.
Answer:
Let's think step by step.

user
\left[ \frac{3}{4}, 1 \right]
As $x$ ranges over all real numbers, find the range of
\[f(x) = \sin^4 x + \cos ^2 x.\]Enter your answer using interval notation.
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