PreCalc Unit 4 Trig Identities
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18 Terms
1
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sec(x) =
1/cos(x)
2
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csc(x) =
1/sin(x)
3
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(Reciprocal Identity) cot(x) =
1/tan(x)
4
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tan(x) =
sin(x)/cos(x)
5
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(Quotient Identity) cot(x) =
cos(x)/sin(x)
6
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sin²(x) + cos²(x) =
1
7
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1 + cot²(x) =
csc²(x)
8
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tan²(x) + 1 =
sec²(x)
9
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sin(2A) =
2sinAcosA
10
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cos2A (1) =
cos²A - sin²A
11
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cos2A (2) =
2cos²A - 1
12
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cos2A (3)
1 - 2sin²A
13
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sin(A + B) =
sinAcosB + cosAsinB
14
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sin(A - B) =
sinAcosB - cosAsinB
15
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cos(A + B) =
cosAcosB - sinAsinB
16
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cos(A - B) =
cosAcosB + sinAsinB
17
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tan(A + B)
(tanA + tanB)/(1- tanAtanB)
18
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tan(A - B) =
(tanA - tanB)/(1 + tanAtanB)
Note 
Flashcards (45)