Unit 3C - Trigonometric Identities
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Last updated 12:08 PM on 2/10/26
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23 Terms
1
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cos2x =
1 - sin2x
2
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sin2x =
1 - cos2x
3
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1 =
cos2x + sin2x
4
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1 =
sec2x - tan2x
5
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tan2x =
sec2x - 1
6
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sec2x =
1 + tan2x
7
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cot2x =
csc2x - 1
8
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1 =
csc2x - cot2x
9
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csc2x =
cot2x + 1
10
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sin(x + y) =
sin(x)cos(y) + cos(x)sin(y)
11
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sin(x - y) =
sin(x)cos(y) - cos(x)sin(y)
12
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cos(x + y) =
cos(x)cos(y) - sin(x)sin(y)
13
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cos(x - y) =
cos(x)cos(y) + sin(x)sin(y)
14
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sin(2x) =
2sin(x)cos(x)
15
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cos(2x) =
cos2x - sin2x
16
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cos(2x) =
2cos2x - 1
17
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cos(2x) =
1 - 2sin2x
18
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sin(x) =
cos((π/2) - x)
19
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cos(x) =
sin((π/2) - x)
20
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csc(x) =
sec((π/2) - x)
21
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sec(x) =
csc((π/2) - x)
22
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tan(x) =
cot((π/2) - x)
23
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cot(x) =
tan((π/2) - x)
