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OpenStudy (anonymous):

How do we determine x=(4-y^2)^1/2? <--diagram in example 2. Thx!

OpenStudy (anonymous):

I figured it out. :D

OpenStudy (shadowfiend):

Awesome. If you get a chance to post a quick summary I'm sure that would help others :)

OpenStudy (anonymous):

Pythagorean theorem - triangle using r=2 for hypotenuse and y-subi for one side. Which will leave the remaining side x to the above equation after solving.

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