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29 December, 07:50

How to find value of cos 1395degree

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  1. 29 December, 08:18
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    The cosine repeats itself every 360 degrees. So you could keep subtracting 360 from 1395 until it lies within the 0 ... 360 range.

    Subtract 3*360 and find cos 315° = ½ √2
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