Help me understand Trigo angles and radians

[resting]

I have a text that says the following:

tan(5pi/6) = -tan(pi/6) = -1/sqrt rt 3

sin(2pi/3) = sin(pi/3) = sqrt rt 3/2

cos(5pi/3) = cos(pi/3) = 1/2

sin(5pi/4) = -sin(pi/4) = -1/sqrt rt 2

I couldn't understand any of it. Anyone could help explain on this?
I need to understand these to find exact values.

Thanks.

 

[Deleted member 4993]

I have a text that says the following:

tan(5pi/6) = -tan(pi/6) = -1/sqrt rt 3

sin(2pi/3) = sin(pi/3) = sqrt rt 3/2

cos(5pi/3) = cos(pi/3) = 1/2

sin(5pi/4) = -sin(pi/4) = -1/sqrt rt 2

I couldn't understand any of it. Anyone could help explain on this?
I need to understand these to find exact values.

Thanks.

If you did not understand these reading your text-book, you need face-to-face help. Ask your teacher.