AP Pre-Calculus Trig Identities
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Last updated 1:47 AM on 4/9/25
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25 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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tan²(x) +1=
sec²x
11
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1+cot²x=
csc²x
12
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sin²x=
1-cos²x
13
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cos²x=
1-sin²x
14
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tan²x=
sec²x-1
15
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cot²x=
csc²x-1
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sec²x-tan²x=
1
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csc²x-cot²x
1
18
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sin(a+b)=
sin(a) cos(b) + cos(a) sin(b)
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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(2x) =
2sinxcosx
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cos2x =
cos²x-sin²x
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cos2x =
2cos²x - 1
25
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cos2x =
1 - 2sin²x
Note 
Flashcards (36)