8.4 Things to Memorize

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15 Terms

1
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Reciprocal Ids

  • sin(θ) × csc(θ)= 1

  • cos(θ) × sec(θ)= 1

  • tan(θ) × cot(θ)= 1

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Quotient Ids

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3
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cos(-θ)=__

cos(θ)

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Sec(-θ)=__

Sec(θ)

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Sin(-θ)=__

-sin(θ)

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csc(-θ)=__

-csc(θ)

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tan(-θ)=__

-tan(θ)

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cot(-θ)=__

-cot(θ)

9
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Sin(π/2 - θ)=__

cos(θ)

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cos(π/2 - θ)

sin(θ)

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tan(π/2 - θ)=__

cot(θ)

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cot(π/2 - θ)=__

tan(θ)

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sec(π/2 - θ)=__

csc(θ)

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csc(π/2 - θ)=__

sec(θ)

15
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Pythagorean Identities

  • cos2(θ) + sin2(θ)= 1

  • tan2(θ) + 1= sec2(θ)

  • cot2(θ) + 1= csc2(θ)