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Problems in Mathematical Analysis.pdf - pwp.net.ipl.pt

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Sec. 7]_Higher-Order Derivatives and Differentials_201<br />

1910. Show that the function<br />

where cp and \|) are arbitrary twice differentiable functions, satis-<br />

fies the equation of oscillations of a str<strong>in</strong>g<br />

1911. Show that the function<br />

satisfies the equation<br />

1912. Show that the function<br />

satisfies the equation<br />

tion<br />

x 5-, 2 + 2w ' -7<br />

2 , , 2 n<br />

dv y<br />

d s u<br />

dxdy<br />

r- + y x-, = 0.<br />

l J<br />

dy*<br />

1913. Show that the function z = f[x + y(y)] satisfies the equa-<br />

dz d 2 2 dzd 2 z<br />

dx dx dy<br />

1914. F<strong>in</strong>d u-^u(x, y) if<br />

~<br />

'<br />

2<br />

dy dx<br />

dTSy^^<br />

1915. Determ<strong>in</strong>e the form of the function u = u(x, y), which<br />

satisfies the equation<br />

1916. F<strong>in</strong>d d*z if<br />

1917. F<strong>in</strong>d d 2<br />

u if<br />

1918. F<strong>in</strong>d d*z if<br />

1919. F<strong>in</strong>d dz and d*z if<br />

11 = .<br />

rn (f} whpr^ / -r y 2 - \l^ -1- /y*<br />

\^/F<br />

vviitivx t> j\r<br />

| y .<br />

z = u v where u = ~ ,<br />

v = xy.

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