Question

Question #10453

Answer 1

`- 281^@54; - 438^@36`

Explanation:

cos x = 0.2
Calculator and unit circle give -->
`x = +- 78^@46`
In the interval (-90, - 360), the answer is
`x = - 360 + 78.46 = - 281^@54` (co-terminal to `78^@46`)
In the interval (-360, - 450), the answer is :
`x = - 360 - 78.46 = - 438^@46`.
We get the final answer by adding (- 360) + (- 78.46) = - 438.36.