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17 terms

Trig Identities

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Pythagorean Identity 1
sin²A + cos²A = 1
Pythagorean Identity 2
tan²A + 1 = sec²A
Pythagorean Identity 3
1 + cot²A = csc²A
Cos(A+B)
CosACosB - SinASinB
Cos(A-B)
CosACosB + SinASinB
Sin(A+B)
SinACosB + CosASinB
Sin(A-B)
SinACosB - CosASinB
Sin2A
2SinACosA
Cos2A 1
Cos²A-Sin²A
Cos2A 2
1-2Sin²A
Cos2A 3
2Cos²A-1
Tan(A+B)
(TanA+TanB)/(1-TanATanB)
Tan(A-B)
(TanA-TanB)/(1+TanATanB)
Tan2A
(2TanA)/(1-Tan²A)
sin²A
(1-cos2A)/2
cos²A
(1+cos2A)/2
tan²A
(1-cos2A)/(1+cos2A)