How can I convert matrix4x4 in angle?

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Hello everyone. How can I convert matrix4x4 in angle?

Example I have a matrix4x4:

M11:-0.018038683 M12:0.5770684 M13:1.0431728E-06 M14:-3166.6748
M21:1.4651617E-06 M22:-1.3457767E-06 M23:0.76980036 M24:-2240.2686
M31:-1.0009131 M32:-0.03128772 M33:1.8503413E-06 M34:721.87134
M41:-0.9995118 M42:-0.031243915 M43:1.8477507E-06 M44:727.8607

I know that M11:-0.018038683 M12:0.5770684 is a horizontal line.

If the camera does not rotate the result: M11:0.00 M12:0.58 enter image description here

If the camera is turned back, the result: M11:0.00 M12:-0.58 enter image description here

I need to convert this data into 360 Thank you.

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