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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
Sin (2A) 2sinAcosA
Cos (2A) cos^2A-sin^2A 2cos^2A-1 1-2sin^2A
Tan (2A) 2tanA/1-tan^2A
Sin A/2 ±√1-cosA/2
Cos A/2 ±√1+cosA/2
Tan A/2 sinA/1+cosA ±√1-cosA/1+cosA 1-cosA/sinA
cos^2A+sin^2A= 1
cot^2A+1= csc^2A
1+tan^2A= sec^2
Created by: swimmingninja42
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