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17 February, 13:24

What is the exact value of cos 5pi/4 radians?

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  1. 17 February, 16:51
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    -Radical two (square root of two) / 2

    Because:

    5pi/4 = 225 the reference angle for that is 45 degrees, cos 45 = Radical two (square root of two) / 2 and because 225 is in quadrant three and only tangent is positive in quadrant 3, the cos is negative
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