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trig identities

formulas

QuestionAnswer
cos(A - B) cosAcosB + sinAsinB
cos(A + B) cosAcosB - sinAsinB
sin(A + B) sinAcosB + cosAsinB
sin(A - B) sinAcosB - cosAsinB
tan(A + B) (tanA + tanB) / (1 - tanAtanB)
tan(A - B) (tanA - tanB) / (1 + tanAtanB)
cos2A cos^2A - sin^2A | 2cos^2A - 1 | 1 - 2sin^2A
sin2A 2sinAcosA
tan2A (2tanA) / (1 - tan^2A)
cos(A / 2) +- √(cosA + 1) / 2
sin(A / 2) +- √(1 - cosA) / 2
tan(A / 2) (sinA) / (1 + cosA)
Created by: quinnj44
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