If $\sqrt { x + y } + \sqrt { x - y } = 4$ find the value of $\frac { d y } { d x }$ at the point (5, 4).

Name: If $\sqrt { x + y } + \sqrt { x - y } = 4$ find the value of $\frac { d y } { d x }$ at the point (5, 4).
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The Answer of If $\sqrt { x + y } + \sqrt { x - y } = 4$ find the value of $\frac { d y } { d x }$ at the point (5, 4).

If x+y+x−y=4\sqrt { x + y } + \sqrt { x - y } = 4x+y​+x−y​=4

If $\sqrt { x + y } + \sqrt { x - y } = 4$