precalc
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18 Terms
1
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sin²(theta)+cos²(theta)
=1
2
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1+cot²(theta)
csc²(theta)
3
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1+tan²(theta)
sec²(theta)
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[(pi/2)-theta]
cos(theta)
9
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cos[(pi/2)-theta]
sin(theta)
10
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tan[(pi/2)-theta]
cot(theta)
11
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csc[(pi/2)-theta]
sec(theta)
12
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sec[(pi/2)-theta]
csc(theta)
13
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cot[(pi/2)-theta]
tan(theta)
14
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sin(2theta)
2sin(theta)cos(theta)
15
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cos(2theta)
cos²(theta)-sin²(theta)=1-2sin²(theta)=2cos²(theta)-1
16
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tan(2theta)
2tan(theta)/1-tan²(theta)
17
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cos²(theta)
[1+(cos(2theta)]/2
18
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sin²(theta)
[1-cos(2theta)]/2
Note 
Flashcards (22)