Trig identities
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14 Terms
1
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1
sin2x + cos2x
2
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sec2x
1 + tan2x
3
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csc2x
1 + cot2x
4
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sin(α + β)
sin(α) cos(β) + cos(α) sin(β)
5
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sin(α − β)
sin(α) cos(β) − cos(α) sin(β)
6
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cos(α + β)
cos(α) cos(β) − sin(α) sin(β)
7
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cos(α − β)
cos(α) cos(β) + sin(α) sin(β)
8
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tan(α+β)
tan(α)+tan(β) / 1−tan(α)tan(β)
9
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tan(α−β)
tan(α)−tan(β) / 1+tan(α)tan(β)
10
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sin(2x)
2sin(x)cos(x)
11
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cos(2x) (cos and sin)
cos2(x) − sin2(x)
12
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cos(2x) (sin)
1 − 2sin2(x)
13
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cos(2x) (cos)
2cos2(x) − 1
14
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tan(2x)
2tan(x) / 1 - tan2(x)
Note 
Flashcards (100)