Trig Identities w/out titles

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28 Terms

1
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sin(x) / cos(x) =

tan(x)

2
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cos(x) / sin(x) =

cot(x)

3
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1 / sin(x) =

csc(x)

4
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1 / cos(x) =

sec(x)

5
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1 / tan(x) =

tan(x)

6
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sin²(x) + cos²(x) =

1

7
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1 - sin²(x) =

cos²(x)

8
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1 - cos²(x) =

sin²(x)

9
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sec²(x) - tan²(x) =

1

10
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sec²(x) - 1 =

tan²(x)

11
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tan²(x) + 1 =

sec²(x)

12
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csc²(x) - cot²(x) =

1

13
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csc²(x) - 1 =

cot²(x)

14
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cot²(x) + 1 =

csc²(x)

15
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sin(α + β) =

sin(α)cos(β) + cos(α)sin(β)

16
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sin(α - β) =

sin(α)cos(β) - cos(α)sin(β)

17
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cos(α + β) =

cos(α)cos(β) - sin(α)sin(β)

18
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cos(α - β) =

cos(α)cos(β) + sin(α)sin(β)

19
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tan(α + β) =

(tan(α) + tan(β)) / (1 - tan(α)tan(β))

20
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tan(α - β) =

(tan(α) - tan(β)) / (1 + tan(α)tan(β))

21
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sin(2x) =

2sin(x)cos(x)

22
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cos(2x) =

cos²(x) - sin²(x)

23
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cos(2x) also =

2cos²(x) - 1

24
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cos(2x) also also =

1 - 2sin²(x)

25
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tan(2x) =

(2tan(x)) / (1 - tan²(x))

26
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sin²(x) =

½(1 - cos(2x))

27
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cos²(x) =

½(1 + cos(2x))

28
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tan²(x) =

(1 - cos(2x)) / (1 + cos(2x))