Trig Identities Flashcards

1
Q

cos2A

0

A

cos^2 A- sin^2 A

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2
Q

cos2A

2

A

2cos^2 A - 1

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3
Q

cos2A

1

A

1- 2sin^2 A

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4
Q

sin2A

A

2sinAcosA

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5
Q

cotA

A

(cosA)/ (sinA)

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6
Q

sin(A+-B)

A

sinAcosB+-cosAsinB

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7
Q

cos(A+-B)

A

cosAcosB-+sinAsinB

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8
Q

1 + tan^2 A

A

sec^2 A

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9
Q

1 + cot^2 A

A

cosec^2 A

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10
Q

sin^2 A + cos^2 A

A

1

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11
Q

cos^2 A

A

1 - sin^2 A

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12
Q

sin^2 A

A

1 - cos^2 A

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13
Q

tanA

A

(sinA) / (cosA)

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14
Q

cos^2 A

A

1/2 * (1 + cos2A)

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15
Q

sin^2 A

A

1/2 * (1 - cos2A)

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16
Q

secx

17
Q

cosecx

18
Q

cotx

19
Q

cos^2 A- sin^2 A

20
Q

2cos^2 A - 1

21
Q

1- 2sin^2 A

22
Q

2sinAcosA

23
Q

(cosA)/ (sinA)

24
Q

sinAcosB+-cosAsinB

25
Q

cosAcosB-+sinAsinB

26
Q

sec^2 A

A

1 + tan^2 A

27
Q

cosec^2 A

A

1 + cot^2 A

28
Q

1 - sin^2 A

29
Q

1 - cos^2 A

30
Q

(sinA) / (cosA)

31
Q

1/2 * (1 + cos2A)

32
Q

1/2 * (1 - cos2A)

33
Q

1/(cosx)

34
Q

1/(sinx)

35
Q

1/(tanx)