Question

How do you calculate `cos^-1(0.7253)`?

Answer 1

`43^@51 + k360^@`
`316^@49 + k360^@`

Explanation:

Find arccos (0.7253)
Use calculator and trig unit circle -->
cos x = 0.7253 ---> arc `x = +- 43^@51 + k360^@`
Since the arc `- 43^@51` is co-terminal to arc `(360 - 43.51 = 316^@49)`, there for, the general answers are:
`43^@51 + k360^@`
`316^@49 + k360^@`