Let F(x, Y) = Ln(x + 2y) $\frac { \partial ^ { 2 } \mathrm { f } } { \partial \mathrm { x } \partial \mathrm { y } }$

True/False

Let f(x, y) = ln(x + 2y). Find $\frac { \partial ^ { 2 } \mathrm { f } } { \partial \mathrm { x } \partial \mathrm { y } }$ . Is $- ( x + 2 y ) ^ { 2 }$ the correct answer?