1. If the first identity is really then I think that the statement is false. Take e.g. x=pi/4.
2. *use the operator arctan [/tex]*tan^{-1} [/tex]*
3. This is a quadratic equation. Let *then the equation becomes .*
1. If the first identity is really then I think that the statement is false. Take e.g. x=pi/4.
2. *use the operator arctan [/tex]*tan^{-1} [/tex]*
3. This is a quadratic equation. Let *then the equation becomes .*