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OpenStudy (anonymous):
solve the equation cosx=(-1/2) if 0 degrees < (or equal to) x< ( or equal to) 360 degrees a) 135 degrees, 225 degrees b) 210 degrees,330 degrees c) 150 degrees, 210 degrees d) 120 degrees, 240 degrees
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OpenStudy (anonymous):
take inverse cosine. x = 60 or 300
OpenStudy (anonymous):
i pluged it in the calculator and i got an erro
OpenStudy (anonymous):
oops, it didn't see it's negative 1/2
OpenStudy (anonymous):
it's 120 and 240
OpenStudy (anonymous):
thakns alot mane
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