Precalculus: Trig Identities
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18 Terms
1
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sin²x + cos²x
1
2
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tan²x + 1
sec²x
3
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cot²x + 1
csc²x
4
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cos(x+y)
cosx cosy - sinx siny
5
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cos(x-y)
cosx cosy +sinx siny
6
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sin(x+y)
sinx cosy + siny cosx
7
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sin(x-y)
sinx cosy - siny cosx
8
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tan(x+y)
tanx + tany / 1 - tanx tany
9
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tan(x-y)
tanx - tany / 1 + tanx tany
10
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cos2x
cos²x - sin²x
2cos²x - 1
1 - 2sin²x
11
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sin2x
2sinx cosx
12
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tan2x
2tanx / 1 - tan²x
13
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cos(x/2)
±√(1+cosx)/2
14
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sin(x/2)
±√(1-cosx)/2
15
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tan(x/2)
sinx / 1 + cosx
1 - cosx / sinx
16
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cos3x
4cos³x - 3cosx
17
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sin3x
3sinx - 4sin³x
18
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tan3x
3tanx - tan³x / 1 - 3tan²x
Note 
Flashcards (44)