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

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256_Mult<strong>ipl</strong>e and L<strong>in</strong>e Integrals__[Ch. 7<br />

2173*. Change the variables u = x + y, v = xy <strong>in</strong> the <strong>in</strong>tegral<br />

i i<br />

\dx\f (x,y)dy.<br />

2174**. Evaluate the double <strong>in</strong>tegral<br />

(S)<br />

where S is a region bounded by<br />

H<strong>in</strong>t. Make the substitution<br />

Sec. 3. Comput<strong>in</strong>g Areas<br />

b 2<br />

the curve<br />

~~fi 2<br />

-_<br />

'<br />

2<br />

k<br />

>, y br s<strong>in</strong> cp.<br />

1. Area <strong>in</strong> rectangular coord<strong>in</strong>ates. The area of a plane region S is<br />

(S)<br />

If the region S is def<strong>in</strong>ed<br />

then<br />

by the <strong>in</strong>equalities a^x^b, q> (x) ^ y ^ \|) (x) ,<br />

b op (X )<br />

S = \dx J<br />

a cp (x)<br />

2. Area <strong>in</strong> polar coord<strong>in</strong>ates. If a region S <strong>in</strong> polar coord<strong>in</strong>ates r and q><br />

is def<strong>in</strong>ed by the <strong>in</strong>equalities a^cp^p, / (cp)^/' ), then<br />

dy.<br />

P F P)<br />

S = ffrdcpdr= C<br />

6/9<br />

C /-dr.<br />

tegrals<br />

2 x+2<br />

(S) a<br />

_<br />

/(q<br />

2175. Construct regions whose areas are expressed by the <strong>in</strong>-<br />

a) dx ) d; b) dy d*.<br />

J dx j dy; b) j dy<br />

J<br />

Evaluate these areas and change the order of <strong>in</strong>tegration.<br />

2176. Construct regions whose areas are expressed dy the <strong>in</strong>-<br />

tegrals<br />

arc tan 2 * sec

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