AP PreCalc Trig Identities
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13 Terms
1
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cos²(x)+sin²(x)
1
2
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tan²(x)+1
sec²(x)
3
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cot²(x)+1
csc²(x)
4
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cos(a+b)
cos(a)cos(b)-sin(a)sin(b)
5
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cos(a-b)
cos(a)cos(b)+sin(a)sin(b)
6
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sin(a+b)
sin(a)cos(b)+cos(a)sin(b)
7
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sin(a-b)
sin(a)cos(b)-cos(a)sin(b)
8
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sin(2x)
2sin(x)cos(x)
9
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cos(2x)
1-2sin²(x)
cos²(x)-sin²(x)
2cos²(x)-1
10
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cos²(x)
(1+cos(2x))/2
11
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sin²(x)
(1-cos(2x))/2
12
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sin(x/2)
sqrt((1-cos(x))/2)
13
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cos(x/2)
sqrt((cos(x)+1)/2)