Precalc cosine question
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Precalc cosine question

[From: ] [author: ] [Date: 12-01-08] [Hit: ]
if it was from 0 to -90deg would it then be positive??-Correct.The answer is -1/6pi because the interval is negative.If the interval was from 0 to pi/2, then your answer would be correct.......
If cos x = sqrt(3)/2 and -pi/2 <= x <= 0, what the the exact value of x in radians?

i got 1/6pi (30 deg) but why is the answer -1/6pi? is it because the interval goes from -90deg to 0? if it was from 0 to -90deg would it then be positive??

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Correct. The answer is -1/6pi because the interval is negative. If the interval was from 0 to pi/2, then your answer would be correct.

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x = -pi/6 + 2kpi => forgot this one
x = pi/6 + 2kpi
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