How do I find the value of cos 7π?

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How do I find the value of cos 7π?

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Answer 1 · 2015-10-25T12:31:20

$cos 7 π = - 1$ $cos 7 pi = -1$

Explanation:

You may know that $cos 0 = 1$ $Cos 0 = 1$ and $cos π = - 1$ $cos pi = -1$
If you keep adding $2 π$ $2 pi$ to the angle, the value doesn't change
So, $cos π + 2 π = cos 3 \cdot π$ $cos pi + 2 pi = cos 3 * pi$ is also = - 1. Similarly, $cos 5 \cdot π, cos 7 \cdot π, cos 9 \cdot π$ $cos 5 * pi, cos 7 * pi, cos 9 * pi$ etc. in general $cos (2 \cdot n + 1) \cdot π$ $cos (2 * n + 1) * pi$ , where n is an integer like 1, 2, 3, etc, are -1

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How do I find the value of cos 7π?

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