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Introduction to Trigonometry

Intro to trigonometric ratios

9:17 · Free preview33

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Lessons14 lessons

Introduction to Trigonometry6

1

PlayingIntro to trigonometric ratios9:17Free 2

Trigonometric ratios in right triangles12:12 3

Special right triangles intro- 19:41 4

Special right triangles intro (part 2)9:25 5

30-60-90 triangle example problem6:41 6

Intro to Pythagorean trigonometric identities10:05

Some Applications of Trigonometry3

7

Intro to heights and distances12:47 8

Heights and distances word problem 112:08 9

Heights and distances word problem 210:42

Arithmetic Progressions5

10

Intro to arithmetic progressions5:23 11

Extending arithmetic sequences1:07 12

Nth term of an arithmetic progression5:29 13

Arithmetic series intro3:56 14

Arithmetic series formula7:46

Q1. What is sin θ in a right triangle?

sin θ = opposite side ÷ hypotenuse.

Q2. Write the value of sin 30°, cos 60° and tan 45°.

sin 30° = 1/2, cos 60° = 1/2 and tan 45° = 1.

Q3. Prove that sin²θ + cos²θ = 1.

In a right triangle, (opposite)² + (adjacent)² = (hypotenuse)². Divide both sides by (hypotenuse)²: sin²θ + cos²θ = 1.

Q1. tan θ is equal to…

Asin θ × cos θBsin θ ÷ cos θCcos θ ÷ sin θD1 ÷ sin θ

Q2. The value of sin 90° is…

A0B1/2C1Dnot defined

Q3. If sin A = 3/5, then cos A = ?

A4/5B3/4C5/4D5/3

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