Trig identities
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16 Terms
1
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sin(α ± β) =
= sinα*cosβ
2
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cos(α ± β) =
= cosα*cosβ
3
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tan(α ± β) =
= tanα ± tanβ/1 ∓ tanα*tanβ
4
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csc(α ± β) =
= secα secβ cscα cscβ/secα cscβ ± cscα secβ
5
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sec(α ± β) =
= secα secβ cscα cscβ/cscα cscβ ∓ secα secβ
6
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cot(α ± β) =
= cotα cotβ ∓ 1/cotβ ∓ cotα
7
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sin(2θ) =
= 2sinθcosθ
8
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cos(2θ) =
= cos(θ)2 - sin(θ)2
9
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csc(x) =
1/sin(x) =
10
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sec(x) =
1/cos(x) =
11
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cot(x) =
1/tan(x)
12
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sec2(x) =
1 + tan2(x) =
13
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csc2(x) =
1 + cot2(x) =
14
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sin(x/2) =
±√(1 - cos(x)/2)
15
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cos(x/2) =
±√(1+cos(x)/2)
16
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tan(x/2) =
1 - cos(x)/sin(x) =
Note 
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