Trig Identities

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12 Terms

1
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Pythagorean Identity

Cos(θ)² + Sin(θ)² = 1

2
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Cos(-θ)=

Cos(θ)

3
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Sin(-θ)=

-Sin(θ)

4
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Tan(-θ)=

-Tan(θ)

5
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Cos(90-θ)=

Sin(θ)

6
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Sin(90-θ)=

Cos(θ)

7
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Cos(180-θ)=

-Cos(θ)

8
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Sin(180-θ)=

Sin(θ)

9
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Tan(180-θ)=

-Tan(θ)

10
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Cos(180+θ)=

-Cos(θ)

11
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Sin(180+θ)=

-Sin(θ)

12
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Tan(180+θ)=

Tan(θ)