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especially the radians?

do you just need 90, 180, 370, 0 degrees, or all reference anglew

all reference angles

you only need to know three angle
30,45,60 for every else you can derive easily

ok i got that what about the radians for each angle how do you remember those

so then 60/180 = pi/3

radian/3

pi/3 radian

what about tangent

iknow it is sin/cos but i cant divide radicals by radicals

So for example lets find tangent of 30
sin 30= 1/2
cos 30= sqrt(3)/2
1/2* 2/sqrt(3)
2/2sqrt(3)