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January 28, 2015

January 28, 2015

Posted by **-** on Friday, November 13, 2009 at 10:44pm.

cosx + 0.75 = 0

- advanced functions -
**Reiny**, Friday, November 13, 2009 at 11:25pmcosx = -.75

the cosine is negative in II and III

take inverse cosine of +.75, this will give you the reference angle

for angle in II, take pi - reference angle

for angle in III take pi + reference angle

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