Question

I am a little bit confused when it comes to thos problem relatiing to trigonometry:unit circle: sin, cos, tan

Answer 1

Why would you need to include -\[-(\sqrt{2}/2)\]

why cant you stop at -(1/sqrt 2)

Answer 2

you can't leave the denominator with root , you have to rationalize it,
it's a mathematical rule

Answer 3

If you don't mind, how do you do that.