Precalculus Identities

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19 Terms

1
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Sin

1/csc

2
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Cos

1/sec

3
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Tan

Sin/cos

4
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cscx

1/sinx

5
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sec x

1/cos x

6
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Cot

1/tan or cos/sin

7
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1-sin²x

cos²x

8
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1-cos²x

sin²x

9
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sin² x-1

-cos² x

10
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cos²x-1

-sin²x

11
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1+tan²x

sec²x

12
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1+cot²x

csc²x

13
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sin²x+cos²x

1

14
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sin (a +b)

sin A cos B + cos A sin B

15
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cos (a +b)

cosA cosB - sinA sinB

16
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sin (a - b)

sinAcosB-cosAsinB

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cos (a-b)

cosAcosB + sinAsinB

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sin(2a)

2sinAcosA

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cos(2a)

cos²A-sin²A