Trig formulas

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18 Terms

1
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sin(x+y)

sinXcosY + sinYcosX

2
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sin(x-y)

sinXcosY - sinYcosX

3
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cos(x+y)

cosXcosY -sinXsinY

4
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cos(x-y)

cosXcosY + sinXsinY

5
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tan(x+y)

(tanX + tanY)/(1 - tanXtanY)

6
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tan(x-y)

(tanX - tanY)/(1 + tanXtanY)

7
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sin(2x)

2sinXcosX

8
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cos(2x)

2cos²X - 1

1 - 2sin²X

9
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tan(2x)

(2tanX)/(1 - tan²X)

10
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cos²θ + sin²θ

1

11
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sin²θ

1 - cos²θ

12
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cos²θ

1 - sin²θ

13
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tanθ

sinθ/cosθ

14
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sinθ

tanθcosθ

15
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cosθ

sinθ/tanθ

16
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cscθ

1/sinθ

17
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secθ

1/cosθ

18
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cotθ

1/tanθ

cosθ/sinθ