Further Trig Identities

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15 Terms

1
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Cos(A-B) = ?

CosA*CosB + SinA*SinB

2
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Cos(A+B) = ?

CosA*CosB - SinA*SinB

3
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Sin(A+B) = ?

SinA*CosB + CosA*SinB

4
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Sin(A-B) = ?

SinA*CosB - CosA*SinB

5
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Tan(A+B) = ?

(TanA + TanB) / (1 - TanA*TanB)

6
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Tan(A-B) = ?

(TanA - TanB) / (1 + TanA*TanB)

7
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Sin(2A) = ?

2SinA*CosA

8
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Cos(2A) = ? (Cos² … form)

Cos²A - Sin²A

9
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Cos(2A) = ? (2 … form)

2Cos²A - 1

10
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Cos(2A) = ? (1 - … form)

1 - 2sin²A

11
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Tan(2A) = ?

(2TanA) / (1 - Tan²A)

12
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Sec²θ = ?

1 + Tan²θ

13
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Cosec²θ = ?

1 + Cot²θ

14
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1 = ? (Sin²x …

Sin²x + Cos²x

15
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Tanx = ?

(Sinx) / (Cosx)