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OpenStudy (anonymous):
tan3x-tan x= tan2x ....? is it true?
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OpenStudy (callisto):
since tan(A-B) = (tanA -tanB)/ ( 1+ tanAtanB) (tanA -tanB) = tan (A-B) ( 1+ tanAtanB ) tan 3x -tanx = tan (3x-x) (1+ tan3xtanx) = tan 2x ( 1+tan3xtanx) So... what do you think?
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