Write sin81 in terms of cosine

Jgr asked Jun 21, 2023

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Jgr asked Jun 21, 2023

by Jgr

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23 votes

Answer:

Since 81° is less than 90, we can express this in terms of a cofunction. sin(θ) = cos(90 - θ) sin(81) = cos(90 - 81) sin(81) = cos(9)

Explanation:

Nuno Santos answered Jun 25, 2023

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