Determine the order and degree (if exists) of the following differential equations: 
\(\frac { { d }^{ 2 }y }{ { dx }^{ 2 } } +3{ \left( \frac { dy }{ dx } \right) }^{ 2 }={ x }^{ 2 }log\left( \frac { { d }^{ 2 }y }{ { dx }^{ 2 } } \right) \)

Determine the order and degree (if exists) of the following differential equations: 
\(3\left( \frac { { d }^{ 2 }y }{ { dx }^{ 2 } } \right) ={ \left[ 4+{ \left( \frac { dy }{ dx } \right) }^{ 2 } \right] }^{ \frac { 3 }{ 2 } }\)

Determine the order and degree (if exists) of the following differential equations: 
dy + (xy − cos x)dx = 0

Solve:\(\frac { dy }{ dx } \) = (3x+y+4)².

Solve the following differential equations or show that the solution of 
\(\\ \\ \\ \frac { dy }{ dx } =\sqrt { \frac { 1-{ y }^{ 2 } }{ 1-{ x }^{ 2 } } } \)