can someone tell me why this is true(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\vec{F}=T(\frac{dy(x+\Delta x)}{dx}-\frac{dy(x)}{dx})\cong T(\frac{d^2y(x)}{dx^2})\Delta x[/tex]

and am i correct in understanding the notation in that that dy(x) simply means the same as dy when it is implied dy is a function of x?

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# Classical Wave Equation

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