Trigonometric Identities

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18 Terms

1
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sin (x) / cos (x)

tan (x)

2
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1 / cos (x)

sec (x)

3
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1 / sin (x)

csc (x)

4
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cos (x) / sin (x)

cot (x)

5
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1 / tan (x)

cot (x)

6
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1 / cot (x)

tan (x)

7
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1 / csc (x)

sin (x)

8
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1 / sec (x)

cos (x)

9
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sin²(x) + cos²(x)

1

10
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sec²(x) - 1

tan²(x)

11
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csc²(x) -1

cot²(x)

12
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tan²(x) + 1

sec²(x)

13
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1 + cot²(x)

csc²(x)

14
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cos(2theta)

2 cos²(theta) - 1

15
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sin(2theta)

2 sin (theta) cos (theta)

16
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sin (-theta)

- sin (theta)

17
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cos(-theta)

cos(theta)

18
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tan(-theta)

- tan (theta)