Arctan(3x)-Arctan(2x)=Arctan(0.2)
问题描述:
Arctan(3x)-Arctan(2x)=Arctan(0.2)
tan(Arctan(3x)-Arctan(2x))=(3x-2x)/(1+6x^2)
这一步,
答
tan(Arctan(3x)-Arctan(2x))=(3x-2x)/(1+6x^2)=tan(Arctan(0.2))=0.2
===>6x^2-5x+1=0
===>(3x-1)(2x-1)=0
===>x=1/3或x=1/2