Trig Identities
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Trig Identities for Trig/Pre-Calc CH 5
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9 Terms
1
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Cos 2A
Cos²A - Sin²A, or 2Cos²A - 1 or 1 - 2Sin²A.
2
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Sin2A
2SinA CosA
3
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Tan2A
2TanA / (1 - Tan²A)
4
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Cos(A+B)
CosA CosB - SinA SinB
5
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Cos(A-B)
CosA CosB + SinA SinB
6
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Sin(A+B)
SinA CosB + CosA SinB
7
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Sin(A-B)
SinA CosB - CosA SinB
8
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Tan(A+B)
TanA + TanB / (1 - TanATanB)
9
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Tan(A-B)
TanA - TanB / (1 + TanATanB)
Note 
Flashcards (61)