Trig Identities
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Last updated 3:29 PM on 12/5/23
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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
