Double Angle Identities

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14 Terms

1
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sin(2A)

2sin(A)cos(A)

2
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cos(2A)

cos²(A)-sin²(A)
1-2sin²(A)
2cos²(A)-1

3
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tan(2A)

2tan(A) / 1-tan²(A)

4
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tan(A)

sin(A) / cos(A)

5
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cot(A)

cos(A) / sin(A)

6
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sin(A)

1 / cosec(A)

7
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cos(A)

1 / sec(A)

8
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tan(A)

1 / cot(A)

9
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cosec(A)

1 / sin(A)

10
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sec(A)

1 / cos(A)

11
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cot(A)

1 / tan(A)

12
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sin²(A) + cos²(A) = 1

13
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sec²(A) - tan²(A) = 1

14
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cosec²(A) - cot²(A) = 1