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

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d*z d*z<br />

dx*~ a*b*z><br />

:<br />

dxdy<br />

*;*;<br />

i/<br />

1954. d2 = dx dw; *<br />

2 2<br />

-^^dr/ f . 1955. d2 = 0; d 2 2= Tc(^ a<br />

2* IO<br />

:^;<br />

,966. a) =-<br />

7<br />

1965.<br />

1971. a) -20;<br />

s<strong>in</strong>a<br />

Answers 439<br />

:<br />

^<br />

dy*''<br />

+ rf 2<br />

l/ )- l956 - dz =<br />

). 1961. -r- =00; T" 11111<br />

"^"* T~9 =<br />

dz c cos y<br />

1953.<br />

= 1;<br />

dxfy<br />

u<br />

r-^ = 0. 1964. dw = -<br />

.<br />

s<strong>in</strong><br />

z<br />

:<br />

dy);<br />

1967. =F;(r, cp) cos <br />

q,^. 9)^. 1968.<br />

|). 1969. - + + ^O. 1970. -<br />

b) g-0.<br />

1972.<br />

pp^-. 1974. ~=0. 1975. tt ~-. z== 0. 1976. ^<br />

dz<br />

dx

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