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3 January, 14:23

What is cos (7π5) ?

0.61

-0.61

0.31

-0.31

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Answers (1)
  1. 3 January, 15:55
    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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