Precalc trig identities

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15 Terms

1
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sin(A+B)

sinAcosB + sinBcosA

2
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cos(A+B)

cosAcosB - sinAsinB

3
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tan(A+B)

tanA + tanB / 1 - tanAtanB

4
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sin(A-B)

sinAcosB - sinBcosA

5
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cos(A-B)

cosAcosB + sinAsinB

6
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tan(A-B)

tanA - tanB / 1+tanAtanB

7
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sin(2A)

2sinAcosA

8
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cos(2A)

cos²A - sin²A

2cos²A - 1

2sin²A + 1

9
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tan(2A)

2tanA / 1 - tan²A

10
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sin²x

1-cos(2x) / 2

11
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cos²x

1+cos(2x) / 2

12
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tan²x

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

13
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SIn(1/2A)

+- Square root 1-cosA/2

14
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cos(1/2A)

+- root 1+cosA/2

15
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tan(1/2A)

+- root 1-cosA/1+cosA