Posted by **nick** on Sunday, September 19, 2010 at 8:46am.

for tan2x=3 i get should get two values 71.56 and 251.56 but i dnt knw how to solve to get this two values. pls help me with this. thanx in advance.

- maths -
**Reiny**, Sunday, September 19, 2010 at 8:54am
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°

check:

tan(2x39.76) = tan 79.52 = 3

same for the other one.

I don't know how "they" got your answers.

- ARGGG ! maths -
**Reiny**, Sunday, September 19, 2010 at 8:57am
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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