/sci/ - Science & Math

>>14836477
Thank you for your time, anon. I get that changing the sign of the Reference angle trig function ratios according to ASTC gives you the trig function ratios of the original angle, but why are the trig functions of the Referance angle similar to the original angle (with sign change)?

In the example given, the ratio of the R.A. trig function (pi/3) is equal to the trig function ratio of the original angle (5pi/3) with the sign changed according to ASTC. Why is this true?

Hope I explained my question well.