pre calc trig identities

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20 Terms

1
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sin²θ + cos²θ

1

2
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1 + tan²θ

sec²θ

3
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1 + cot²θ

csc²θ

4
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cscθ

1/sinθ

5
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secθ

1/cosθ

6
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cotθ

1/tanθ

7
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sin(-θ)

-sin(θ)

8
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cos(-θ)

cos(θ)

9
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tan(-θ)

-tan(θ)

10
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cos(2θ)

cos²θ-sin²θ

11
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cos(2θ)

2cos²θ-1

12
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cos(2θ)

1-2sin²θ

13
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sin(2θ)

2sinθcosθ

14
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tan(2θ)

(2tanθ)/(1 - tan²θ)

15
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sin(α+β)

sinαcosβ+sinβcosα

16
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cos(α+β)

cosαcosβ-sinαsinβ

17
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tan(α+β)

(tanα+tanβ)/(1-tanαtanβ)

18
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sin(α-β)

sinαcosβ-sinβcosα

19
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cos(α-β)

cosαcosβ+sinαsinβ

20
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tan(α-β)

(tanα-tanβ)/(1+tanαtanβ)