Trigonometric Rules and Identities

Question 1

How do you find the second principal solution for sine?

Answer 1

sinθ = sin(180-θ)
take original number from 180

Question 2

How do you find the second principal solution for cosine?

Answer 2

cosθ = cos(360-θ)
take original number from 360

Question 3

what are the two main equations for trig identities?

Answer 3

tanθ = sinθ/cosθ

sin²θ + cos²θ = 1

Question 4

how do you find the range of values for sine and cosine?

Answer 4

find the two principal solutions then ±360

Question 5

how do you find the range of values for tans?

Answer 5

find the principle values and then ±180