#int (1-cos 3x)/(1-cos x)# ?
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The expression you provided is in the form of a trigonometric function. Using the trigonometric identity (1 - \cos^2(\theta) = \sin^2(\theta)), the expression simplifies to ( \frac{\sin^2(3x)}{\sin^2(x)} ).
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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