Find the range of $f(x) = \sin^4 x - \sin x \cos x  +\cos^4 x.$
Question:
Find the range of $f(x) = \sin^4 x - \sin x \cos x  +\cos^4 x.$
Answer:
Let's think step by step.

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\left[ 0, \frac{9}{8} \right]
Find the range of $f(x) = \sin^4 x - \sin x \cos x  +\cos^4 x.$
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