Memorizing identities
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Last updated 6:18 PM on 3/18/26
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18 Terms
1
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Sin reciprocal identity
sin0=1/csc
2
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Cos reciprocal identity
cos0=1/sec
3
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Tan reciprocal identity
tan0=1/cot0
4
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Csc reciprocal identity
csc0=1/sin
5
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Cot reciprocal identity
cot0=1/tan0
6
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Quotient identities: tan
tan0=sin/cos
7
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Quotient identities: cot
cot0=cos/sin
8
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Pythagorean identities: sin
sin²0+cos²0=1
9
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Pythagorean identities: tan
1+tan²0=sec²0
10
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Pythagorean identities: cot
1+cot²0=csc²0
11
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Even/odd: list the odds
sin, csc, tan, cot
12
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Even/odd: list the evens
cos, sec
13
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Cofunction identities: sin
sin(90-0)=cos0
14
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Cofunction identities: cos
cos(90-0)=sin0
15
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Cofunction identities: tan
tan(90-0)=cot0
16
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Cofunction identities: csc
csc(90-0)=sec0
17
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Cofunction identities: sec
sec(90-0)=csc0
18
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Cofunction identities: cot
cot(90-0)=tan0