Year 2 Trigonometric Identites

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Last updated 9:36 AM on 9/1/26
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14 Terms

1
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secθ

1/cosθ

2
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cosecθ

1/sinθ

3
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cotθ (2 expressions)

  • 1/tanθ

  • cosθ/sinθ


4
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sec²θ + 1

tan²θ

5
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cot²θ + 1

cosec²θ

6
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sin(2A)

2sin²AcosA

7
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cos(2A)

  • cos²A - sin²A

  • 2cos²A - 1

  • 1 - 2sin²A


8
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tan(2A)

2tanA/1-tan²A

9
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sin(A+B)

sinAcosB + cosAsinB

10
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sin(A-B)

sinAcosB - cosAsinB

11
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cos(A+B)

cosAcosB - sinAsinB

12
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tan(A+B)

tanA+tanB/1 - tanAtanB

13
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cos(A+B)

cosAcosB - sinAsinB

14
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tan(A-B)

tanA-tanB/1 + tanAtanB