Trig Identities

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Pre-Calculus

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22 Terms

1
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sin σ

1/csc σ

2
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sec σ

1/cos σ

3
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tan σ

1/cot σ OR sin σ/cos σ

4
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csc σ

1/sin σ

5
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cos σ

1/sec σ

6
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cot σ

1/tan σ OR cos σ/sin σ

7
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sin² σ + cos² σ

1

8
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cot² σ

csc² σ - 1

9
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tan² σ + 1

sec² σ

10
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cos(A+B)

cos A × cos B - sin A × sin B

11
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cos(A-B)

cos A × cos B + sin A × sin B

12
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sin(A+B)

sin A × cos B + cos A × sin B

13
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sin(A-B)

sin A × cos B - cos A × sin B

14
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tan(A+B)

tan A+tan B/1-tan A*tan B

15
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tan(A-B)

tan A-tan B/1+tan A*tan B

16
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cos 2A

cos²A-sin²A

1-2sin²A

2cos²A-1

17
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tan 2A

2tanA/1-tan²A

18
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sin 2A

2sinA×cosA

19
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tan(x/2)

20
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tan(x/2)

21
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cos(x/2)

22
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sin(x/2)