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csc
1/sin
sec
1/cos
cot
1/tan
tan
sin/cos
sin pythag
cos² + sin² = 1
csc pythag
1 + cot² = csc²
sec pythag
1+ tan² = sec²
cofunc sin
sin = cos(90-x)
cofunc sec
sec = csc(90-x)
cofunc tan
tan = cot (90-x)
cos(-x)
cosx
tan(-x)
-tanx
sin(-x)
-sinx
30,60,90
1, 1/2, √3/2
45,45,90
1,√2/2,√2/2