Precalc trig identities
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12 Terms
1
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Sine(A+B)=
Sin(A)Cos(B)+ Sin(B)Cos(A)
2
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Cosine(A+B)=
Cos(A)Cos(B)- Sin(A)(Sin(B)
3
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Sine(A-B)=
Sin(A)Cos(B)- Sin(B)Cos(A)
4
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Cosine(A-B)=
Cos(A)Cos(B)+ Sin(A)Sin(B)
5
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Tangent(A+B)=
(Tan(A)+Tan(B))/(1-(Tan(A)Tan(B)))
6
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Tangent(A-B)=
(Tan(A)-Tan(B))/(1+(Tan(A)Tan(B)))
7
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Sine(2x)=
2Sin(x)Cos(x)
8
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Cosine(2x)=
cos²(x)-sin²(x), 2cos²(x)-1, 1- 2sin²(x)
9
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Tangent(2x)=
(2tan(x))/1-tan²(x)
10
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Sine(x/2)=
± √(1-cos(x))/2
11
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Cosine(x/2)=
±√(1+Cos(x))/2
12
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Tangent(x/2)=
±√(1-Cos(x))/(1+Cos(x))
Note 
Flashcards (51)