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Flashcards in Trigonometry Deck (18):
1

Arc Length

θr

2

Sector Area

1/2 r^2 θ

3

Segment Area

1/2 r^2 (θ - sin θ)

4

tan θ equation

sin θ/cos θ

5

cot θ

cos θ/sin θ

6

Trig equations which = 1

cos^2 θ + sin^2 θ = 1
cot^2 θ - cosec^2 θ = 1
tan^2 θ - sec^2 θ = 1

7

sin 2θ

2 sin θ cos θ

8

cos 2θ

cos^2 θ - sin^2 θ

9

tan 2θ

(2tan θ) / (1 - tan^2 θ)

10

sin (a + b)

sin a cos b + cos a sin b

11

sin (a - b)

sin a cos b - cos a sin b

12

cos (a + b)

cos a cos b - sin a sin b

13

cos (a - b)

cos a cos b + sin a sin b

14

tan (a + b)

(tan a + tan b) / (1 - tan a tan b)

15

tan (a - b)

(tan a - tan b) / (1 + tan a tan b)

16

Small Angle tan θ

tan θ ≈ θ

17

Small Angle sin θ

sin θ ≈ θ

18

Small Angle cos θ

cos θ ≈ 1 - (θ^2) / 2