trigo Flashcards

1
Q

sin(A+B)

A

sinA cosB + cosAsinB

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2
Q

sin(A-B)

A

sinAcosB-cosAsinB

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3
Q

cos(A+B)

A

cosAcosB-sinAsinB

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4
Q

cos(A-B)

A

cosAcosB+sinAsinB

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5
Q

tan(A+B)

A

(tanA+ tanB)/1-tanAtanB

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6
Q

tan(A-B)

A

(tanA- tanB)/1+tanAtanB

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7
Q

sin2 A - sin2 B

A

sin(a+b). sin (a-b)

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8
Q

cos2 A - sin2 B

A

cos (A+B).cos(A-B)

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9
Q

2sinAcosB

A

sin(A+B) + sin (A-B)

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10
Q

2cosAsinB

A

sin(A+B) - sin (A-B)

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11
Q

2cos(A)cos(B)

A

cos(A+B)+ cos(A-B)

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12
Q

2sinAsinB

A

cos(A-B)-cos(A+B)

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13
Q

sin2A

A

2sinAcosA

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14
Q

sin2A [in tan terms]

A

2tanA/1+tan2 A

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15
Q

cos2A

A

cos2 A - sin2 A or 2cos2 A -1 or 1-2sin2 A

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16
Q

cos2A in tan

A

(1- tan2 A)/ (1+tan2 A)

17
Q

1+ cos2A

A

2cos2 A

18
Q

1-cos2A

A

2sin2 A

19
Q

tanA in cos and sin

A

(1-cos2A)/sin2A or sin2A/1+cos2A

20
Q

tan2A

A

2tanA/1-tan2 A

21
Q

sin3A

A

3sinA-4sin3 A

22
Q

cos3A

A

4cos3 A-3cosA

23
Q

tan3A

A

(3tanA-tan3 A)/1-tan2 A