fundamental Identities
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Last updated 10:47 PM on 2/9/24
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23 Terms
1
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sinθ
opposite/hypotenuse
2
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sinθ (x/y/r)
y/r
3
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cosθ
adjacent/hypotenuse
4
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cosθ (x/y/r)
x/r
5
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tanθ
opposite/adjacent
6
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tanθ (x/y/r)
y/x
7
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cscθ
hypotenuse/opposite
8
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cscθ (x/y/r)
r/y
9
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secθ
hypotenuse/adjacent
10
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secθ (x/y/r)
r/x
11
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cotθ
adjacent/opposite
12
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cotθ (x/y/r)
x/y
13
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Reciprocal of sinθ (1/___)
1/cscθ
14
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Reciprocal of cscθ (1/___)
1/sinθ
15
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Reciprocal of cosθ (1/___)
1/secθ
16
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Reciprocal of secθ (1/___)
1/cosθ
17
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Reciprocal of tanθ (1/___)
1/cotθ
18
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Reciprocal of cotθ (1/___)
1/tanθ
19
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Quotient Identity for tanθ
sinθ/cosθ
20
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Quotient Identity for cotθ
cosθ/sinθ
21
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Pythagorean Identity #1 (for r)
cos²θ + sin²θ = 1
22
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Pythagorean Identity #2 (for x)
1 + tan²θ = sec²θ
23
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Pythagorean Identity #3 (for y)
cot²θ + 1 = csc²θ