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sin² + cos² =
1
1 + cot² =
csc²
tan² + 1 =
sec²
sin(2x) =
2sinxcosx
cos(2x) =
cos²x - sin²x
cos(2x) =
2cos²x - 2
1 - 2sin²x
tan(2x) =
2tanx / 1-tan²x