Trig Identities

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15 Terms

1
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sin(A + B)

sinAcosB + sinBcosA

2
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sin(A - B)

sinAcosB - sinBcosA

3
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cos(A + B)

cosAcosB - sinAsinB

4
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cos(A - B)

cosAcosB + sinAsinB

5
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sin2A

2sinAcosA

6
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cos2A #1

cos2A - sin2A

7
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cos2A #2

2cos2A - 1

8
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cos2A #3

1 - 2sin2A

9
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sin2A+cos2A

1

10
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1+tan2A

sec2A

11
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cotA+1

csc2A

12
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Law of Sines

sinA/a = sinB/b = sinC/c

13
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Law of Cosines

c2 = a2+b2-2ab(cosC)

14
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sin2A

1/2(1-cos2A)

15
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cos2A

1/2(1+cos2A)