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Write sin81 in terms of cosine
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Write sin81 in terms of cosine

User Dhafin Rayhan
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1 Answer

8 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:

User Alex Volovoy
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