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?

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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 dont 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!