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26-02-2020
Mathematics

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

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sqdancefan sqdancefan

26-02-2020

Answer:

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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