Trig Identities ( only the ones not given on the data sheet ) Flashcards by Amisha Patel

Q

sinx/cosx = ?

A

tanx … sinx/cosx = tanx

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Q

1/sinx = ?

A

cosecx

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Q

1/cosx = ?

A

secx

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Q

1/tanx = ?

A

cosx/sinx OR cotx

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Q

Identity involving sin^2x

A

sin^2x + cos^2x = 1

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Q

identity involving cot^2x

A

1 + cot^2x = cosec^2x

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Q

identity involving tan^2x

A

1 + tan^2x = sec^2x

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Q

double angle formula for sin2x

A

2sinxcosx

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Q

double angle formula for cos2x ( ALL three )

A

cos^2x - sin^2x = 1
2cos^2x-1
3> 1-2sin^2x

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Q

double angle formula for tan2x

A

2tanx/1-tan^2x

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