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Use an Identity to find the exact value of the expression

Use an Identity to find the exact value of the expression-example-1
User Bas H
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1 Answer

3 votes

Answer:


\cos((7\pi)/(8))=-\sqrt{(√(2)+1)/(2√(2))}

Step-by-step explanation:

First, we can note that:


(7\pi)/(8)=\pi-(\pi)/(8)

Then:


\cos((7\pi)/(8))=\cos(\pi-(\pi)/(8))

User Riftninja
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