Is the brightest star in the sky the one which is closest to us?
Unfortunately the closest star is not the brightest.
The brightest star is Sirius (Apla cannis majoris), which is 8.3 light years away, and the closest star is Proxima Century, which is 4.3 light years away.
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No, Proxima Centauri is the star closest to Earth, not Sirius, the brightest star in the sky.
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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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