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Find the exact value of cos (-315)° .
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3 votes
Find the exact value of cos (-315)° .

User Stephen Donnell
by
7.5k points

1 Answer

4 votes

Answer:


(1)/(√(2))

Explanation:

cos(-315)° = cos 315°

  • The cosine function is an even function.

cos 315° = cos 45°

  • cos(360°-x)=cos(x)

This is equal to


(1)/(√(2))

User Idalis
by
8.3k points
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