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sin2θ + cos2θ =
1
1 + tan2θ =
sec2θ
sin(2θ) =
2sinθcosθ
cos(2θ) =
cos2θ - sin2θ
sin(-θ) =
-sinθ
cos(-θ) =
cosθ
1 + cot2θ =
csc2θ