Trigonometric Identities
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Last updated 1:43 AM on 2/19/25
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23 Terms
1
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sinx
1/cscx
2
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cosx
1/secx
3
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tanx
1/cotx
4
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cscx
1/sinx
5
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secx
1/cosx
6
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cotx
1/tanx
7
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tanx
sinx/cosx
8
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cotx
cosx/sinx
9
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sin²x + cos²x
1
10
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sin²x
1 - cos²x
11
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cos²x
1 - sin²x
12
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1 + tan²x
sec²x
13
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tan²x
sec²x - 1
14
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1
sec²x - tan²x
15
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1 + cot²x
csc²x
16
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cot²x
csc²x - 1
17
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1
csc²x - cot²x
18
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sin(a + b)
sin a cos b + cos a sin b
19
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cos(a + b)
cos a cos b - sin a sin b
20
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sin(a - b)
sin a cos b - cos a sin b
21
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cos(a - b)
cos a cos b + sin a sin b
22
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sin(2u)
2 sin u cos u
23
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cos(2u)
cos²u - sin²u
2cos²u - 1
1 - 2sin²u
Note 
Flashcards (96)