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tan(x) =
sin(x) / cos(x) = 1 / cot(x)
cot(x) =
cos(x) / sin(x) = 1 / tan(x)
sec(x) =
1 / cos(x)
csc(x) =
1 / sin(x)
sin2(x) + cos2(x) =
1
tan2(x) + 1 =
sec2(x)