Trig Identities Flashcards by Liz O'Neill

Q

sinØ

A

1/cscØ

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Q

cosØ

A

1/secØ

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Q

tanØ (1/x)

A

1/cotØ

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Q

tanØ (x/x)

A

sinØ/cosØ

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Q

cscØ

A

1/sinØ

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Q

secØ

A

1/cosØ

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Q

cotØ (1/x)

A

1/tanØ

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Q

cotØ (x/x)

A

cosØ/sinØ

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Q

sin^2Ø+cos^2Ø

A

1

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Q

1+tan^2Ø

A

sec^2Ø

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Q

1+cot^2Ø

A

csc^2Ø

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Q

sin^2x

A

1/2(1-cos2x)

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Q

cos^2x

A

1/2(1+cos2x)

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Q

cos^2(2x)

A

1/2(1+cos4x)

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Q

rt(a^2-x^2)

A

x=asinØ, 1-sin^2Ø=cos^2Ø, from -pi/2

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Q

rt(a^2+x^2)

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A

x=atanØ, 1+tan^2Ø=sec^2Ø, -pi/2

Q

rt(x^2-a^2)

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A

x=asecØ, sec^2Ø-1=tan^2Ø,

0

Q

sin(A+B)

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A

sinAcosB+cosASinB