Pythagorean Identities

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9 Terms

1
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Pythagorean Identity

sin²θ + cos²θ = 1

2
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Secant Identity

1 + tan²θ = sec²θ

3
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Cosecant Identity

1 + cot²θ = csc²θ

4
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Cosine Identity

cos²θ = 1 - sin²θ

5
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Tangent Identity

tan²θ = sec²θ - 1

6
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Cotangent Identity

cot²θ = csc²θ - 1

7
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Sine-Cosine Relation

sin²θ - 1 = -cos²θ

8
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Alternate Pythagorean Identity

1 = sec²θ - tan²θ

9
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Alternate Cosecant Identity

1 = csc²θ - cot²θ