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

Determine approximate solutions for this equation in the interval x is all real numbers [0, 2pi), to the nearest hundredth of a radian:

cosx + 0.75 = 0

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