Trig Identities Formula Sheet
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For Pre Calc classes that need to memorize trig identities for a quiz
Last updated 5:09 PM on 4/27/23
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23 Terms
1
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Pythagorean Identities - 1
sin^2x + cos^2x \= 1
2
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Pythagorean Identities - 2
1 + tan^2x \= sec^2x
3
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Pythagorean Identities - 3
1 + cot^2x \= csc^2x
4
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Even/Odd Functions - sin(-x)
-sinx
5
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Even/Odd Functions - cos(-x)
cosx
6
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Even/Odd Functions - tan(-x)
-tanx
7
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Even/Odd Functions - csc(-x)
-cscx
8
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Even/Odd Functions - sec(-x)
secx
9
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Even/Odd Functions - cot(-x)
\-cotx
10
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Reciprocal Identities - sinx
1/cscx
11
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Reciprocal Identities - cosx
1/secx
12
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Reciprocal Identities - tanx
1/cotx
13
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Reciprocal Identities - cscx
1/sinx
14
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Reciprocal Identities - secx
1/cosx
15
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Reciprocal Identities - cotx
1/tanx
16
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Quotient Identities - tanx
sinx/cosx
17
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Quotient Identities - cotx
cosx/sinx
18
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Cofunction Identities - sin(π/2-x)
cosx
19
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Cofunction Identities - cos(π/2-x)
sinx
20
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Cofunction Identities - tan(π/2-x)
cotx
21
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Cofunction Identities - cot(π/2-x)
tanx
22
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Cofunction Identities - csc(π/2-x)
secx
23
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Cofunction Identities - sec(π/2-x)
cscx