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23 January, 02:19

What is the relationship between cos (90°) and cos (-90°) ?

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  1. 23 January, 03:38
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    they have the same value (0)

    Step-by-step explanation:

    Cosine is an even function, meaning that cos (x) = cos (-x). When x=90°, we have ...

    cos (90°) = cos (-90°)

    Both values happen to be zero.
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