Trig Review Flashcards by Andrew Aldrich

Q

rad to degrees conversion

A

x°=x/180 * π

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Q

degrees to rad conversion

A

x rads= 180/pi * x°

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Q

(Right triangle) Sin(theta)

A

opp/hyp

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Q

(Right triangle) Cos(theta)

A

adj/hyp

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Q

(Right triangle) Tan(theta)

A

Opp/adj

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Q

(right triangle) Cot(theta)

A

adj/opp

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Q

(right triangle) sec(theta)

A

hyp/adj

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Q

(right triangle) csc(theta)

A

hyp/opp

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Q

(trig identity) sin²x + cos²x=?

A

1

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Q

(trig identity) 1+tan²x=?

A

sec²x

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Q

1+cos²x=?

A

csc²x

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Q

(trig identity) sin(-theta)=?

A

-sin(theta)

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Q

(trig identity) cos(-theta)=?

A

cos(theta)

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Q

(trig identity) sin(x + or - y)=?

A

sin(x) cos(y) + or - sin(y) cos(x)

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Q

(trig identity) cos(x + or - y)=?

A

cos(x) cos(y) + or - sin(x) sin(y)

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Q

(trig identity) sin 2x=?

A

2 sin x cos x

Q

(trig identity) cos²x=?

A

(1+cos 2x)/2

Q

(trig identity) sin²x=?

A

(1-cos 2x)/2

Q

Unit circle

A

Q

Sin(0)=?

A

0

Q

cos(o)=?

A

1

Q

Sin(π/6)=?

A

(sqrt 1)/2

Q

Sin(π/4)=?

A

(Sqrt 2)/2

Q

Sin(π/3)=?

A

(sqrt 3)/2

Sin(π/2)=?

(sqrt 4)/2

Cos(π/6)=?

(sqrt 3)/2

Cos(π/4)=?

(sqrt 2)/2

Cos(π/3)=?

1/2

Cos(π/2)=?

0