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Trig Identities

TermDefinition
tan(A + B) (tanA + tanB) / (1 - tanAtanB)
tan(A - B) (tanA - tanB) / (1 + tanAtanB)
sin(2A) 2sinAcosA
#1 cos(2A) cos^2(A) - sin^2(A)
#2 cos(2A) 1 - 2sin^2(A)
#3 cos(2A) 2cos^2(A) - 1
tan(2A) (2tanA) / (1 - tan^2(A))
sin(A/2) +- sqrt((1 - cosA) / 2)
cos(A/2) +- sqrt((1 + cosA) / 2)
#1 tan(A/2) +- sqrt((1 - cosA) / (1 + cosA))
#2 tan(A/2) sinA / (1 + cosA)
#3 tan(A/2) (1 - cosA) / sinA
1 + cot^2x csc^2x
tan^2x + 1 sec^2x
Created by: capple2016
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