Posted by House on Friday, October 3, 2008 at 1:02pm.
You are doing this the hard way.
make a diagram
since tan theta = √3/2, and tan theta = opposite/adjacent, make the oppose √3 and the adjacent 2
In your head you could do Pythagoras and get the hypotenuse √7
since cos theta = adjacent/hypotenuse
cos theta = 2/√7
which is what you got.
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