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

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Sec. 9]_Differentiation of Implicit Functions_209<br />

1941. Let y be a [unction of x def<strong>in</strong>ed by the equation<br />

F<strong>in</strong>d dy dhj and ^<br />

* ma di' d? ana dx"'<br />

1942. y is a function def<strong>in</strong>ed by the equation<br />

Show that ^ = and expla<strong>in</strong> the result obta<strong>in</strong>ed.<br />

1943. F<strong>in</strong>d % if y=\+y x .<br />

1944. F<strong>in</strong>d ^ and g if y = A;<br />

1945. F<strong>in</strong>d (g)<br />

y*<br />

and if<br />

\ax J K~\ (g) \ax z<br />

jx=i<br />

Tak<strong>in</strong>g advantage of the results obta<strong>in</strong>ed, show approximately<br />

the portions of the given curve <strong>in</strong> the neighbourhood of the po<strong>in</strong>t<br />

*=1.<br />

1946. The function y is def<strong>in</strong>ed by the equation<br />

and<br />

dx dx*<br />

1947. F<strong>in</strong>d and if<br />

dx dx z<br />

In |?T72 = arc tan<br />

1948. The function z of the variables x and y is def<strong>in</strong>ed by<br />

the equation<br />

c,. j ^2 , ^2<br />

Flnd 5i and %-<br />

x 9<br />

s<br />

-1- 2// 4 z 8<br />

1949. F<strong>in</strong>d ~ and ^ if<br />

dx dy<br />

3;q/z 2r/ + 3 = 0.<br />

A: cosy -|- y cos 2 +zcosx= 1.<br />

1950. The function z is def<strong>in</strong>ed by the equation<br />

F<strong>in</strong>d ^ and -j-<br />

x* + y 2<br />

z 2<br />

xy = 0.<br />

for the system of values *== 1, // = 0, z = l.

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