Trig Identities Flashcards

1
Q

Sin(A+B)

A

Sin(A)Cos(B)+Cos(A)Sin(B)

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2
Q

Cos(A+B)

A

Cos(A)Cos(B)-Sin(A)Sin(B)

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3
Q

Sin(-ø)

A

-sin(ø)

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4
Q

Cos(-ø)

A

Cos(ø)

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5
Q

Sin(2A)

A

2sinAcosA

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6
Q

Cos(2A)

A

Cos^2A-Sin^2A

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7
Q

Tan 2A

A

2tana/1-tan^2a

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8
Q

Tan(a+b)

A

Sin(A+B)/cos(A+B)

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9
Q

Sin^2ø+Cos^2ø

A

1

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10
Q

1+tan^2ø

A

Sec^2ø

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11
Q

Cot^2ø+1

A

Csc^2ø

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12
Q

Cscø

A

1/Sinø

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13
Q

Secø

A

1/Cosø

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14
Q

Cotø

A

1/tanø

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15
Q

Tanø

A

Sinø/Cosø

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16
Q

Cotø

A

Cosø/Sinø

17
Q

Tan(-ø)

A

-Tanø