Trigonometric Identities and Formulas

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15 Terms

1
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tan𝜃

sin𝜃/cos𝜃

2
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cot𝜃

cos𝜃/sin𝜃

3
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csc𝜃

1/sin𝜃

4
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sec𝜃

1/cos𝜃

5
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sin𝜃

1/csc𝜃

6
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cos𝜃

1/sec𝜃

7
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cot𝜃

1/tan𝜃

8
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tan𝜃

1/cot𝜃

9
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sin2𝜃+cos2𝜃=

1

10
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tan2𝜃+1

sec2𝜃

11
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1+cot2𝜃

csc2𝜃

12
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sin(2𝜃)

2sin𝜃cos𝜃

13
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cos(2𝜃)

cos2𝜃-sin2𝜃 = 2cos2𝜃-1 = 1-2sin2𝜃

14
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sin2x

1/2(1-cos2x)

15
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cos2x

1/2(1+cos2x)