Question

prove that tan(x)Xtan(2x)Xtan(3x)=tan(3x)-tan(2x)-tan(x).
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Answer 1

Solution :- As we know that, Tan( A + B ) = tanA + TanB /1- TanA*TanB similarly,

Tan 45º = Tan (20° + 25°) = Tan20° + tan25 /1-

Tan20°Tan25°

1 = tan20° + tan25° / 1 - tan20° tan25°

1 - tan20° tan25º = tan20° tan25° Answer