Ch. 13 Trigonometric Identities And Equations

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Last updated 9:17 PM on 5/19/26
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17 Terms

1
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csc θ =

1 ÷ sin θ

2
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sec θ =

1 ÷ cos θ

3
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cot θ =

1 ÷ tan θ

4
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sin θ ÷ cos θ =

tan θ

5
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cos θ ÷ sin θ =

tan θ

6
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sin2 θ + cos2 θ =

1

7
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tan2 θ + 1 =

sec2 θ

8
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cot2 θ + 1 =

csc2 θ

9
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sin(-θ) =

-sinθ

10
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tan(-θ) =

-tanθ

11
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cos(-θ) =

cosθ

12
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sin (π/2 - θ) =

cosθ

13
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cos (π/2 - θ) =

sinθ

14
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tan(π/2 - θ) =

cotθ

15
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sin(a±b) =

sin a cos b ± cos a sin b

16
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cos(a±b) =

cos a cos b ∓ sin a sin b

17
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tan (a±b) =

(tan a ± tan b) ÷ (1 ∓ tan a tan b)