General trig identities
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16 Terms
1
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cos2x + sin2x
1
2
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a2 (cosine rule)
b2 + c2 - 2 b c cosA
3
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cosA (cosine rule)
(b2 + c2 - a2)/2bc
4
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Sine rule
a/sinA = b/sinB
(same for reciprocals)
5
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Area of triangle using sin
½ a b sinC
6
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sec(x)
1/cos(x)
7
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cosec(x)
1/sin(x)
8
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cot(x)
1/tan(x)
9
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cosec2(x)
1 + cot2(x)
10
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sec2(x)
1 + tan2(x)
11
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sin(A±B)
sinAcosB ± cosAsinB
12
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cos(A±B)
cosAcosB ∓ sinAsinB
13
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tan(A±B)
tanA ± tanB / 1 ∓ tanAtanB
14
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sin(2x)
2sin(x)cos(x)
15
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cos(2x)
cos2(x) - sin2(x)
2cos2(x) -1
1 - 2sin2(x)
16
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tan(2x)
2tan(x) / 1 - tan2(x)
Note 
Flashcards (100)