Chapter 1 -- Section 5
-- More on Identities
y
(x,y)
1
x
cos θ = x = x
y
x
1
y
sin θ = 1 = y
Pythagorean Theorem
x2 + y2 = 12
How do you find the other Pythagorean
identities???
example 1
write csc θ in terms of sin θ only.
example 2
write csc θ in terms of cos θ only.
example 3
write in terms of sin θ and cos θ only. Simplify if possible.
a. csc θ
sec θ
b. sin θ
csc θ
c. csc θ - cot θ cos θ
d. sin b
tan b
did you get this answer???
example 4
2 + =
3
3
4
Simplify.
sin θ
cos θ + =
sin θ
cos θ
example 5
Simplify (3sin θ - 2)(5cos θ - 4)
page 43
1­45 odd
Attachments
pic.jpg