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Evaluate sin(Arcos(-9/√145)).
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2 votes
Evaluate sin(Arcos(-9/√145)).

Evaluate sin(Arcos(-9/√145)).-example-1
User Rgeorge
by
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2 Answers

3 votes

Answer:

a

Explanation:

User Ygram
by
4.8k points
4 votes

Use the fact that
\sin x = √(1-\cos^2 x) to solve it.


\sin(\arccos(-(9)/(√(145))))=\sqrt{1-\cos^2(\arccos(-(9)/(√(145))))} =\\= \sqrt{1-(-(9)/(√(145)))^2}=(8)/(√(145))

User Binod Singh
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5.0k points
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