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並前往https://www.cbsd.org/cms/lib/PA01916442/Centricity/Domain/2027/Day%205__5.5%20Double%20Angle%20Formulas.pdf

5.5 Double Angle Formulas

sin2x = 2 sinxcosx cos2x = cos2x – sinx tan2x = ztan. 2 = 2cos2x – 1. T = 1 – 2sin²x ... sin2x = 2sinxcosx cos2x = cos²x – sin?x tan2x = ton. = 2cos2x – 1.

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