Four Core Groups of Identities

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15 Terms

1
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csc(x)

1/sin(x)

2
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sec(x)

1/cos(x)

3
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cot(x)

1/tan(x)

4
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tan(x)

sin(x)/cos(x)

5
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cot(x)

cos(x)/sin(x)

6
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sin(x)

1/csc(x)

7
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cos(x)

1/sec(x)

8
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tan(x)

1/cot(x)

9
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sin²(x)+cos²(x)=

1

10
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1+tan²(x)

sec²(x)

11
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1+cot²(x)

csc²(x)

12
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2sin(x)cos(x)

sin(2x)

13
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cos²(x)-sin²(x)

=cos(2x)

14
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2cos²(x)-1

=cos(2x)

15
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1-2sin²(x)

=cos(2x)