Trig Identities

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13 Terms

1
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tan θ

(sin θ)/(cos θ)

2
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sec θ

1/(cos θ)

3
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csc θ

1/(sin θ)

4
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cot θ

1/(tan θ)

5
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sin²θ + cos²θ

1

6
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tan²θ+1

sec²θ

7
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1+cot²θ

csc²θ

8
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sin(A+B)

sinA cosB + sinB cosA

9
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cos(A+B)

cosA cosB - sinA sinB

10
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sin(-θ)

-sinθ

11
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cos(-θ)

cosθ

12
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sin(2x)

2sinxcosx

13
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cos(2x)

cos²x - sin²x or 1 - 2sin²x or 2cos²x - 1