February 27, 2017

Homework Help: Trig

Posted by Halle on Sunday, May 31, 2009 at 1:24pm.

The angle 2x lies in the fourth quadrant such that cos2x=8/17.

1.Which quadrant contains angle x?
2. Determine an exact value for cosx
3. What is the measure of x in radians?

I know that quadrant 4 has 2x in it, so quadrant _____ has to have x ?
for part 2, the exact measure of cosx would, it be 4/8.5??? I divided 8 by two and 17 by two.. I don't know if it is right. Check?

For part 3, the measure of x, would I have to take cos^-1(4/8.5) [ if part b is right] to get the measure of x? Thanks!

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