Posted by ann on Friday, April 30, 2010 at 10:07pm.
recall
tan(A+B) = (tanA + tanB)/(1 - tanAtanB)
I believe you meant to type
(tan 25° + tan 5°) /( 1- tan 25° tan 5°)
now it fits the above pattern and it equals
tan(25+5) = tan 30°
from my 30-60-90 triangle I know that
tan 30° = 1/√3 or √3/3
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