Why is [math]\tan(-\theta)=-\tan\theta[/math] and [math]\cot(-\theta)=-\cot\theta[/math]?
Why is [math]\tan{\theta} = \frac{\sin{\theta}}{\cos{\theta}}[/math]?
מדוע [math]\tan(-\theta)=-\tan\theta[/math] ו-[math]\cot(-\theta)=-\cot\theta[/math] זה?
מדוע [math]\tan{\theta} = \frac{\sin{\theta}}{\cos{\theta}}[/math]?