Precalculus - Trigonometry Formula Sheet
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29 Terms
1
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csc t
= 1/sin t
2
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cot t
= cos t/sin t
3
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sec t
= 1/cps t
4
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tan t
= sin t/cos t
5
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cot t
= 1/tan t
6
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sin²t+cos²t
= 1
7
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1+tan²t
= sec²t
8
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1+cot²t
= csc²t
9
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sin(x + y)
= sin x cos y + sin y cox x
10
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sin(x - y)
= sin x cos y - sin y cos x
11
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cos(x + y)
= cos x cos y - sin x sin y
12
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cos(x - y)
= cos x cos y + sin x sin y
13
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tan(x + y)
= tan x + tan y/1 - tan x tan y
14
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tan(x - y)
= tan x - tan y/ 1 + tan x tan y
15
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sin2x
= 2sin x cos x
16
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cos2x
= cos²x - sin²x or 1 - 2sin²x or 2cos²x - 1
17
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tan2x
= 2tanx/1 - tan²x
18
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sin(x/2)
= ±√1-cosx/2
19
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cos(x/2)
= ±√1+cosx/2
20
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tan(x/2)
= 1-cosx/sinx
21
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sin²x
= 1 - cos2x/2
22
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cos²x
= 1+cos2x/2
23
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tan²x
= 1-cos2x/1+cos2x
24
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sinΘ
= opp/hyp
25
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cosΘ
= adj/hyp
26
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tanΘ
= opp/adj
27
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cscΘ
= hyp/opp
28
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secΘ
= hyp/adj
29
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cotΘ
= adj/opp
Note 
Flashcards (45)