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cos2(x) + sin2(x) =
1
cos2(x) =
(1/2)[1 + cos(2x)]
sin2(x) =
(1/2)[1 - cos(2x)]
sec2(x) =
tan2(x) + 1
tan2(x) =
sec2(x) - 1
sin(2x) =
2cos(x)sin(x)