Sine, Cosine, Tangent

1
Lesson 43

• Sine, Cosine, Tangent
• Inverse Functions

2
Sine, Cosine, and Tangent
To help memorize
3
Find the sin x, cos x, and tan x.
4
Find the sin y, cos y, and tan y.
5
Inverse Functions

• arcsin(ratio)
• what angle has sine of the ratio?
• arccos(ratio)
• what angle has cosine of ratio?
• arctan(ratio)
• what angle has tangent of ratio?
• Also has notation sin-1, cos-1, and tan-1
• Make sure calculator mode is set on degree

6
Practice

• Find the angle whose tangent is 0.405.
• Find the angle whose sine is 0.794.

7
You try

• Find the following.
• a) 4cos(75.8?) b) 6sin(37.42?)
• c) the angle whose cosine is 0.632.
• d) the angle whose sine is 0.632.

8
Problem Set 43