PreCalculus - Trigonometry (18 of 54) Using the Unit Circle to Evaluate Trig Functions

In this video I will evaluate the trigonometric functions (sin, cos, tan, csc) using the unit circle.

[BernardoLameiras]

It seems to me your last drawing should be in the third quadrant. The negative angle results in 240° or -120°.

[djcaly]

If the multiple of PI is even, then you end up at 360deg. If it is an odd multiple, you end up at 180deg. Simple as that!

[LinkinParkAsh]

at 2:10 why do you neglect cos(6pi) ? wouldn't its value be 1?

[austinsandoval]

why are you laving square root in the denominator

[trillking]

the answer for tan is wrong. It's −
√
3
3