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

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Sec. 10] Change of Variables 215<br />

and<br />

dz __ z^ dw<br />

dy~~y 2 dv '<br />

Substitut<strong>in</strong>g these expressions <strong>in</strong>to the given equation, we get<br />

or<br />

1969. Transform the equation<br />

x 2<br />

j--<br />

putt<strong>in</strong>g x=--e*.<br />

1970. Transform the equation<br />

putt<strong>in</strong>g<br />

A: cos/.<br />

T<br />

rm 69<br />

1971 Transform the follow<strong>in</strong>g equations, tak<strong>in</strong>g y<br />

gument:<br />

as the ar-<br />

1972. The tangent of the angle [A formed by the tangent l<strong>in</strong>e<br />

MT and the radius vector OM of the po<strong>in</strong>t of tangency (Fig. 69)<br />

is expressed as follows:<br />

tan u=^

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