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(
a little algebra. So cos(
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