sin,cos,tan,cot,sec,csc
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3rd quadrant
-1,0
4th quadrant
0,-1
2nd quadrant
0,1
1st quadrant
1,0
60 degrees
1/2, sqrt3/2
45 degrees
1/sqrt2, 1/sqrt2
co-functions
2 angles that add up to 90
1st quadrant
all functions positve
cos, sec
positive in fourth quadrant
sin, csc
positive in second quadrant
tan, cot
positive in third quadrant
sec
r/x
csc
r/y
30 degrees
sqrt3/2, and 1/2
cos
x/r
cot
x/y
sin
y/r
tan
y/x
