How do you evaluate $cos 3pi$ ?

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How do you evaluate $cos 3pi$ ?

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Answer 1 · 2015-05-05T14:04:38

You can consider it visually as a graph and remember the periodicity of your $cos$ , meaning that it repeats itself at regular intervals (oscillating between $+1$ and $-1$ ):
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so that $cos(3pi)=-1$

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How do you evaluate $cos 3pi$ ?

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