Finding All Angles

Question 1:

Given

0 \leq x \leq 720

solve

8 \cos x = 4

x = \begin{matrix} 60 & 300 \\ 420 & 660 \end{matrix}

Question 2:

Given

0 \leq x \leq 180

solve

5 \cos x = 3

x = \begin{matrix} 53.1 \end{matrix}

Question 3:

Given

0 \leq x \leq 360

solve

8 \cos x = 5

x = \begin{matrix} 51.3 & 308.7 \end{matrix}

Question 4:

Given

0 \leq x \leq 720

solve

8 \cos x = 4

x = \begin{matrix} 60 & 300 \\ 420 & 660 \end{matrix}