tan(x+π/4)=3 tanx=A1/2 B-1/2 C1/4 D-1/4 求解答过程

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tan(x+π/4)=3tanx=A1/2B-1/2C1/4D-1/4求解答过程tan(x+π/4)=3tanx=A1/2B-1/2C1/4D-1/4求解答过程tan(x+π/4)=3tanx=A1/

tan(x+π/4)=3 tanx=A1/2 B-1/2 C1/4 D-1/4 求解答过程
tan(x+π/4)=3 tanx=
A1/2 B-1/2 C1/4 D-1/4 求解答过程

tan(x+π/4)=3 tanx=A1/2 B-1/2 C1/4 D-1/4 求解答过程
tan(x+π/4)=3
=(tanx+tanπ/4)/(1-tanxtanπ/4)
=(1+tanx)/(1-tanx)
=3
1+tanx=3-3tanx
4tanx=2
tanx=1/2