Question

Question #434d7

Answer 1

`x=(npi)/4-5`

Explanation:

`tan3x=-tan(x+20)`

`=>tan(x+20)=tan(-3x)`

`=>x+20=npi-3x,"where "n in ZZ`

`=>x+3x=npi-20`

`=>4x=npi-20`

`=>x=(npi)/4-5`