M 408D Trig Identities

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20 Terms

1
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sinx/cosx =

tanx

2
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cosx/sinx =

cotx

3
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1/tanx =

cotx

4
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sin2x+cos2x =

1

5
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1/cosx =

secx

6
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1/sinx =

cosecx

7
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1+tan2x =

sec2x

8
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sin2x =

2sinxcosx

9
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Option 1. cos2x =

2cos2x-1

10
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Option 2. cos2x =

1-2sin2x

11
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sin2x =

(1-cos2x)/2

12
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cos2x =

(1+cos2x)/2

13
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Derivative of Sinx

Cosx

14
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Derivative of Cosx

-Sinx

15
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Derivative of Tanx

Sec2x

16
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Derivative of Secx

SecxTanx

17
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Antiderivative of Sinx

-Cosx+C

18
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Antiderivative of Cosx

Sinx+C

19
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Antiderivative of Tanx

ln(Secx)+C

20
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Antiderivative of Secx

ln(Secx+Tanx)+C