Trigonometric Identitites

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17 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(2x)

2sin(x)cos(x)

4
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cos(2x)

cos²(x)-sin²(x)

5
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cos(2x)

1 - 2sin²(x)

6
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cos(2x)

2cos²(x) - 1

7
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sin(x)

1/csc(x)

8
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csc(x)

1/sin(x)

9
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cos(x)

1/sec(x)

10
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sec(x)

1/cos(x)

11
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tan(x)

1/cot(x)

12
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cot(x)

1/tan(x)

13
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tan(x)

sin(x)/cos(x)

14
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cot(x)

cos(x)/sin(x)

15
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sin²(x) + cos²(x)

1

16
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1 + tan²(x)

sec²(x)

17
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1+cot²(x)

csc²(x)