PM 1 - 1.5 Trigonometry

Question 1

Pertaining to trigonometric identities, 1 is equal to what?

Answer 1

sin²θ+cos²θ = 1

Question 2

As a trigonometric identity, cos²θ is equal to what?

Answer 2

cos²θ = 1 - sin²θ

Question 3

cosθ is equal to what, as a trigonometric identity?

Answer 3

cosθ = √(1 - sin²θ)

Question 4

Concerning trigonometric identities, sinθ is equal to what?

Answer 4

sinθ = √(1 - cos²θ)

Question 5

As a trigonometric identity, sin²θ is equal to what?

Answer 5

sin²θ = 1 - cos²θ

Question 6

In relation with trigonometric identities, what is tanθ equal to?

Answer 6

tanθ = sinθ/cosθ

Question 7

What are the uses of trigonometric identities?

not in syllabus

Answer 7

Trigonometric equations are used to:
- solve equations
- simplify the given expressions
- prove the given identities
- eliminate θ