Trig Identities

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Last updated 8:52 PM on 9/30/26
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18 Terms

1
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csc(x)= (Pythagorean)

1/sin(x)

2
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sec(x)= (Pythagorean)

1/cos(x)

3
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cot(x)= (Pythagorean)

1/tan(x)

4
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sin²x+cos²x=

1

5
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1+tan²x=

sec²x

6
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1+cot^x=

csc²x

7
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tan(x)=

sin(x)/cos(x)

8
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cot(x)=

cos(x)/sin(x)

9
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sin2(x)=

2sin(x)cos(x)

10
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d/dx sin(x)=

cos(x)

11
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d/dx cos(x)=

-sin(x)

12
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d/dx tan(x)=

sec²x

13
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d/dx sec(x)=

sec(x)tan(x)

14
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d/dx cot(x)

-csc²(x)

15
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d/dx csc (x)=

-csc(x)cot(x)

16
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Cos(x)=

csc(x)/cot(x)

17
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Sin(x)csc(x)=

1

18
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