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4 votes
What is cos(7π5) ?

0.61
-0.61
0.31
-0.31

User Pgrono
by
8.2k points

1 Answer

5 votes

Answer:

-0.31.

Explanation:

Cos (7π/5) is in the third quarter so the cosine is negative.

Cos 7π/5) = - cos (7π/5 - π)

= -cos 2π/5)

= -0.31.

User Sebastiano Merlino
by
7.6k points

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