Transcript Ch 7 – Trigonometric Identities and Equations

Trigonometric Identities and Equations,
part 2
Pythagorean Identities
sin2q + cos2q = 1
sin2q = 1 - cos2q
cos2q = 1 - sin2q
tan2q + 1 = sec2q
cot2q + 1 = csc2q
tan2q = sec2q - 1
cot2q = csc2q - 1
Using the identities you now
know, find the trig value.
1.) If cosθ = 3/4, find secθ
2.) If cosθ = 3/5, find cscθ.
3.) sinθ = -1/3, find cosθ
4.) secθ = -7/5, find sinθ