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15 Terms
1
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sin (A + B)
sinA cosB + cosA sinB
2
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sin (A - B)
sinA cosB - cosA sinB
3
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cos (A + B)
cosA cosB - sinA sinB
4
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cos (A - B)
cosA cosB + sinA sinB
5
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tan (A + B)
(tanA + tanB)/(1 - tanA tanB)
6
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tan (A - B)
(tanA - tanB)/(1 + tanA tanB)
7
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sin(2x)
2sinxcosx
8
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tan(2x)
(2tanx)/(1 - tan²x)
9
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cos(2x)
cos²x - sin²x
2cos²x - 1
1 - 2sin²x
10
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sin²x
(1 - cos(2x))/2
11
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cos²x
(1 + cos(2x))/2
12
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tan²x
(1 - cos(2x))/(1 + cos(2x))
13
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sin(x/2)
± √((1 - cosx)/2)
14
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cos(x/2)
± √((1 + cosx)/2)
15
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tan(x/2)
± √((1 - cosx)/(1 + cosx))
Note 
Flashcards (36)