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Mathematics
Gisselle Haas
2 April, 00:58
What is the exact value of cos 5pi/4 radians?
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Paul Bernard
2 April, 03:19
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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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