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cos u =
1/ sec u
sin u =
1/ csc u
tan u =
1/ cot u
csc u =
1/ sin u
sec u =
1/ cos u
cot u =
1/ tan u
tan u =
sin u/ cos u
cot u =
cos u / sin u
pythagorem identity 1
sin2u + cos2
pythagoream identity 2
1 + tan2u = sec2u
pythagoream identity 3
1 + cot2u = csc2
x of y cards