# What is #Cos^2(pi/7)+cos^2(2pi/7)+cos^2(4pi/7)# is equal to?

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( \cos^2\left(\frac{\pi}{7}\right) + \cos^2\left(\frac{2\pi}{7}\right) + \cos^2\left(\frac{4\pi}{7}\right) ) is equal to 1.

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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.

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