Chapter 7 Trig Identities Flashcards

1
Q

Circle

A

x² + y² = r²

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2
Q

Sin θ

A

y / r

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3
Q

Cos θ

A

x / r

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4
Q

Tan θ

A

y / x or sin θ / cos θ

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5
Q

Cos² θ + Sin² θ

A

1

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6
Q

1 + tan² θ

A

sec² θ

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7
Q

1 + cot² θ

A

csc² θ

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8
Q

csc θ

A

1 / sin θ

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9
Q

sin θ

A

1 / csc θ

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10
Q

csc^-1 x

A

sin^-1 (1/x)

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11
Q

sec θ

A

1 / cos θ

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12
Q

cos θ

A

1 / sec θ

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13
Q

sec^-1 x

A

cos^-1 (1/x)

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14
Q

cot θ

A

1 / tan θ

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15
Q

tan θ

A

1 / cot θ

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16
Q

cot^-1 x

A

tan^-1 (1/x)

17
Q

sin (-θ)

18
Q

tan (-θ)

19
Q

csc (-θ)

20
Q

cot (-θ)

21
Q

cos (-θ)

22
Q

sec (-θ)

23
Q

sin (A + B)

A

sin A cos B + cos A sin B

24
Q

cos (A + B)

A

cos A cos B - sin A sin B

25
tan (A + B)
tan A + tan B / 1 - tan A tan B
26
sin (A - B)
sin A cos B - cos A sin B
27
cos (A - B)
cos A cos B + sin A sin B
28
tan (A - B)
tan A - tan B / 1 + tan A tan B
29
sin 2θ
2 sin θ cos θ
30
cos 2θ
cos²θ - sin²θ, cos²θ - 1, 1 - 2sin²θ
31
tan 2θ
2 tan θ / 1 - tan²θ
32
sin²θ
1 - cos 2θ / 2
33
cos²θ
1 + cos 2θ / 2
34
sin θ/2
±√1 - cos θ / 2
35
cos θ/2
±√1 + cos θ / 2
36
tan θ/2
1 - cos θ / sin θ, sin θ / 1 + cos θ, ±√1 - cos θ / 1 + cos θ