Trig Identities

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12 Terms

1
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sin(a+b)

sin(a)cos(b)+cos(a)sin(b)

2
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cos(a+b)

cos(a)cos(b)-sin(a)sin(b)

3
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sin(a-b)

sin(a)cos(b)-cos(a)sin(b)

4
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cos(a-b)

cos(a)cos(b)+sin(a)sin(b)

5
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tan(a+b)

(tan(a)+tan(b))/1-tan(a)tan(b)

6
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tan(a-b)

(tan(a)-tan(b))/1+tan(a)tan(b)

7
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sin(2a)

2sin(a)cos(a)

8
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cos(2a)

cos²(a)-sin²(a)

9
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tan(2a)

2tan(a)/(1-tan²(a))

10
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sin(a/2)

±√(1-cos(a))/2

11
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cos(a/2)

±√(1+cos(a))/2

12
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tan(a/2)

(1-cos(a))/sin(a)