How to do this math question
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How to do this math question

[From: ] [author: ] [Date: 12-12-04] [Hit: ]
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In a right-angled trigangle ABC,tan(ABC)=2rs divided by r^2 - s^2, where angle BAC is acute and r is bigger than s which is bigger than 0. Find an expression for the value of cos angle BAC in terms or r and s.

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Use Pythagoras and you will find that the length of the hypotenuse is r^2+s^2 after
a little algebra. So cos(
1
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