Trig Identities Flashcards by Unknown Unknown | Brainscape

Q

REC sinθ =

A

1/cscθ

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Q

REC cscθ =

A

1/sinθ

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Q

REC sinθcscθ =

A

1

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Q

REC cosθ =

A

1/secθ

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Q

REC secθ =

A

1/cosθ

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Q

REC cosθsecθ =

A

1

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Q

REC tanθ =

A

1/cotθ

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Q

REC cotθ =

A

1/tanθ

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Q

REC tanθcotθ =

A

1

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Q

QUO tanθ =

A

sinθ/cosθ

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Q

QUO cotθ =

A

cosθ/sinθ

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Q

PYTH sin^2 θ + cos^2 θ =

A

1

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Q

PYTH 1 + tan^2 θ =

A

sec^2θ

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Q

PYTH 1 + cot^2 θ =

A

csc^2θ

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Q

PYTH sec^2 θ - tan^2 θ =

A

1

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Q

PYTH csc^2 θ - cot^2 θ =

A

1

Q

a^2 - b^2 =

A

(a+b)(a-b)

Q

sin(A+B) =

A

sinAcosB+cosAsinB

Q

sin(A-b) =

A

sinAcosB-cosAsinB

Q

cos(A+B) =

A

cosAcosB-sinAsinB

Q

cos(A-B) =

A

cosAcosB+sinAsinB

Q

tan(A+B) =

A

(tanA+cosB)/(1-tanAtanB)

Q

tan(A-B) =

A

(tanA-cosB)/(1+tanAtanB)

Q

sin2A =

A

2sinAcosA

Q

1.) cos2A =

A

cos^2A-sin^2A

Q

2.) cos2A =

A

1-sin^2A

Q

3.) cos2A =

A

2cos^2A-1

Q

tan2A =

A

2tanx/(1-tan^2x)