Question

How do you use a calculator to evaluate `sin(0.65)`?

Answer 1

`x = 40^@54 + k360^@`
`x = 139^@46 + k360^@`

Explanation:

sin x = 0.65 --> use calculator to find arc x.
Press --> 0.65 --> 2nd --> sin --> x = 40^@54.
Unit circle gives another arc x that has the same sin value.
`x = 180 - 40.54 = 139^@46`
Extended answers:
#x = 40^@54 + k360^@ #x = 139^@46 + k360^@#