Trigonometric Identities
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15 Terms
1
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sin(a±b)
sin(a)cos(b)±cos(a)sin(b)
2
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cos(a±b)
cos(a)cos(b)-+sin(a)sin(b)
3
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sin(2θ)
2sin(θ)cos(θ)
4
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cos(2θ)
cos²θ-sin²θ
5
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cos(2θ)
1-2sin²θ
6
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cos(2θ)
2cos²θ-1
7
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1
cos²θ+sin²θ
8
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sec²θ
1+tan²θ
9
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csc²θ
1+cot²θ
10
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sin²θ
1-cos²θ
11
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tan²θ
sec²θ-1
12
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cot²θ
csc²θ-1
13
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cos²θ
1-sin²θ
14
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-tan²θ
1-sec²θ
15
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-cot²θ
1-csc²θ