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bama88
Feb 27, 2008, 10:34 AM
Sketch a right triangle
galactus
Feb 27, 2008, 10:45 AM
Here's a hint that may help:

tan(cos^{-1}(x))=\frac{\sqrt{1-x^{2}}}{x}
Jade27
Mar 25, 2011, 09:09 AM
Arcos (-2)