How do you find the exact value of #cos(theta) = -1#?

Answer 1

We don't really find it so much as just know it's #theta = 180^circ + 360^circ k quad # for integer #k#.

How do we really know #cos 180^circ = -1#? Perhaps the supplementary angle formula:
# cos(180^circ - theta) = - cos theta#
#cos(180^circ - 0^circ) = -cos 0^circ = -1 quad sqrt#
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Answer from HIX Tutor

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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