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OpenStudy (anonymous):
Find all solutions of the equation in the interval [0°, 360°). cos(x)=-sq route of 2 over 2
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OpenStudy (solomonzelman):
Okay, |dw:1408050502138:dw|Cos(45)= S / S√2 = 1/√2 = √2/2 SO cosine of what is =√2/2 ?
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