trig identities
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14 Terms
1
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sin(A + B)
sin A cos B + cos A sin B
2
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sin(A − B)
sin A cos B − cos A sin B
3
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cos(A + B)
cos A cos B − sin A sin B
4
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cos(A − B)
cos A cos B + sin A sin B
5
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tan(A + B)
(tan A + tan B) / (1 − tan A tan B)
6
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tan(A − B)
(tan A − tan B) / (1 + tan A tan B)
7
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sin(2A)
2 sin A cos A
8
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cos(2A)
cos²A − sin²A
9
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cos(2A) (alt)
2 cos²A − 1
10
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cos(2A) (alt 2)
1 − 2 sin²A
11
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tan(2A)
(2 tan A) / (1 − tan²A)
12
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sin²A
(1 − cos 2A) / 2
13
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cos²A
(1 + cos 2A) / 2
14
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tan²A
(1 − cos 2A) / (1 + cos 2A)
Note 
Flashcards (45)