trig identities

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Last updated 1:35 AM on 9/5/26
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11 Terms

1
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tan(x) =

sin(x) / cos(x)

2
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sec(x) =

1 / cos(x)

3
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sin²(x) + cos²(x) =

1

4
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cos²(x) =

1 - cos(2x) / 2

5
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cot(x) =

cos(x) / sin(x)

6
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csc(x) =

1 / sin(x)

7
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tan²(x) + 1 =

sec²(x)

8
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cos²(x) =

1 + cos(2x) / 2

9
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cot(x) =

1 / tan(x)

10
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sin(2x) =

2sin(x)cos(x)

11
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cos(2x) =

1 - 2sin²(x)