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Sanaa
Mathematics
9 March, 19:54
What is cos (7π5) ?
0.61
-0.61
0.31
-0.31
+3
Answers (
1
)
Jadyn Wolfe
9 March, 20:03
0
-0.31.
Step-by-step 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.
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