1.

Tan13x=tan9x+tan4x+tan9x.tan4x.tan13x

Answer» 9x +4x =13x Taking tan on both sidesTan (4x+9x)=tan13x(Tan4x + tan9x ) / 1-- tan4x tan9x = tan13x Tan4x + tan9x = tan13x --tan4x tan9x tan13x ( cross multiply )Tan4x+tan9x + tan4x tan9x tan13x = tan13x
take tan13x=tan(9x+4x)... then solve


Discussion

No Comment Found