reason it this way
let 2x = Ø
then tanØ = 3
Ø must be in quadrants I or III
and using your calculator
Ø = 79.52° or 180+79.52 = 259.52°
then 2x = 79.52 or 2x = 259.52
x=39.76° or x = 129.76°
tan(2x39.76) = tan 79.52 = 3
same for the other one.
I don't know how "they" got your answers.
Sorry your numbers were correct, had my calculator set to GRAD, how silly of me.
Just change my numbers, the method is correct.
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