How do you prove cos(90°-a) = sin(a)?
See the Proof in Explanation Section.
We will use the following Expansion Formula :
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To prove cos(90°-a) = sin(a), we'll use the trigonometric identities:
- cos(θ) = sin(90° - θ)
- sin(θ) = cos(90° - θ)
By substituting (1) into (2), we get:
sin(a) = cos(90° - a)
Therefore, cos(90° - a) = sin(a).
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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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