How would you find [math]\tan(a+b) = \dfrac{ \tan a + \tan b }{ 1 - \tan a \tan b }[/math]?
How do you prove tan^2 (x/2+pi/4) = 1+sinx/1-sinx?
איך תמצא את [math]\tan(a+b) = \dfrac{ \tan a + \tan b }{ 1 - \tan a \tan b }[/math]?
איך מוכיחים tan^2 (x/2+pi/4) = 1+sinx/1-sinx?