Trig Identities

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*=dont need to memorize, good to know and be famillar with

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21 Terms

1
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cos(A-B)

cosAcosB+sinAsinB

2
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cos(A+B)

cosAcosB-sinAsinB

3
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sin(A-B)

sinAcosB-cosAsinB

4
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sin(A+B)

sinAcosB+cosAsinB

5
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tan(A+B)

tanA+tanB

1-tanAtanB

6
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tan(A-B)

tanA-tanB

1+tanAtanB

7
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cos²A+sin²A

1

8
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1+cot²A

csc²A

9
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1+tan²A

sec²A

10
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cos(2A)*

cos²A-sin²A, 1-2sin²A, 2cos²-1

11
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sin(2A)*

2sinAcosA

12
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tan(2A)*

2tanA

1-tan²A

13
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cos(-x)

cos(x)

14
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sec(-x)

sec(x)

15
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sin(-x)

-sin(x)

16
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csc(-x)

-csc(x)

17
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tan(-x)

-tan(x)

18
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cot(-x)

-cot(x)

19
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sin(U/2)*

±sqrt(1-cosU/2)

20
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cos(U/2)*

±sqrt(1+cosU/2)

21
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tan(U/2)*

sinU/1+cosU