7.2(a)

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0><tr> <td valign="top" colspan=3 height=77 BGCOLOR="#006600" TEXT="#F7F7FF"> <div> <B>| </B><A HREF="index.htm" TARGET="_top" TITLE="Ejercicios resueltos de ecuaciones di"><U><B>Ejercicios resueltos de ecuaciones diferenciales</B></U></A><B>  |  </B><A HREF="http://ed21.webcindario.com/index.htm" TARGET="_top" TITLE="http://ed21.webcindario.com/index.htm"><U><B>Análisis matemático</B></U></A><B> |  </B><A HREF="id31.htm" TARGET="_top" TITLE="Boyce y DiPrima"><U><B>Boyce y DiPrima</B></U></A><B> |</B></div> <div> <A HREF="id44.htm" TARGET="_top" TITLE="1.1"><U>1.1</U></A>   |   <A HREF="id46.htm" TARGET="_top" TITLE="2.1(a)"><U>2.1(a)</U></A>   |   <A HREF="id64.htm" TARGET="_top" TITLE="2.1(b)"><U>2.1(b)</U></A>   |   <A HREF="id47.htm" TARGET="_top" TITLE="2.2(a)"><U>2.2(a)</U></A>   |   <A HREF="id55.htm" TARGET="_top" TITLE="2.2(b)"><U>2.2(b)</U></A>   |   <A HREF="id65.htm" TARGET="_top" TITLE="2.2(c)"><U>2.2(c)</U></A>   |   <A HREF="id57.htm" TARGET="_top" TITLE="2.3"><U>2.3</U></A>   |   <A HREF="id60.htm" TARGET="_top" TITLE="2.4"><U>2.4</U></A>   |   <A HREF="id58.htm" TARGET="_top" TITLE="2.5(a)"><U>2.5(a)</U></A>   |   <A HREF="id88.htm" TARGET="_top" TITLE="2.5(b)"><U>2.5(b)</U></A>   |   <A HREF="id89.htm" TARGET="_top" TITLE="2.6(a)"><U>2.6(a)</U></A>   |   <A HREF="id83.htm" TARGET="_top" TITLE="2.8"><U>2.8</U></A>   |   <A HREF="id61.htm" TARGET="_top" TITLE="3.1(a)"><U>3.1(a)</U></A>   |   <A HREF="id62.htm" TARGET="_top" TITLE=" 3.1(b)"><U> 3.1(b)</U></A>   |   <B>7.2(a)</B>   |   <A HREF="id69.htm" TARGET="_top" TITLE="8.1(a)"><U>8.1(a)</U></A></div> <div> </div> </td> </tr><tr> <td valign="top" rowspan="2" width=14 BGCOLOR="#006600" TEXT="#F7F7FF"> <bR> </td> <td valign="top" height=382 BGCOLOR="#FFFFFF" TEXT="#080000"> <bR> <div> <B>Problemas </B><B>7.2(a)</B></div> <bR> <div> <IMG SRC="383c3800.gif" border=0 width="707" height="896" ALT="Documento Microsoft Office Word" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <div> <IMG SRC="384a80d0.gif" border=0 width="680" height="525" ALT="Documento Microsoft Office Word" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <bR> <bR> <bR> <bR> <bR> <bR> <bR> </td> <td valign="top" rowspan="2" width=14 BGCOLOR="#006600" TEXT="#F7F7FF"> <bR> </td> </tr><tr> <td valign="top" height=21 BGCOLOR="#006600" TEXT="#F7F7FF"> <bR> </td> </tr></table></body>