由 yes 於 星期六 十月 07, 2006 8:18 pm
#ed_op#DIV#ed_cl##ed_op#P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"#ed_cl##ed_op#SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 新細明體; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana"#ed_cl#連接#ed_op#/SPAN#ed_cl##ed_op#SPAN lang=EN-US style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana"#ed_cl#OA,OC,OD,AC,AD#ed_op#?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /#ed_cl##ed_op#o:p#ed_cl##ed_op#/o:p#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/P#ed_cl##ed_op#P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"#ed_cl##ed_op#SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 新細明體; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana"#ed_cl#令∠#ed_op#/SPAN#ed_cl##ed_op#SPAN lang=EN-US style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana"#ed_cl#X#ed_op#/SPAN#ed_cl##ed_op#SPAN lang=EN-US style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 新細明體"#ed_cl#=#ed_op#/SPAN#ed_cl##ed_op#SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 新細明體"#ed_cl#∠#ed_op#SPAN lang=EN-US#ed_cl#OBC,#ed_op#/SPAN#ed_cl#則#ed_op#SPAN lang=EN-US#ed_cl#cos(X)=(5^2+8^2-5^2)/2*5*8=4/5#ed_op#o:p#ed_cl##ed_op#/o:p#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/P#ed_cl##ed_op#P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"#ed_cl##ed_op#SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 新細明體"#ed_cl#則#ed_op#SPAN lang=EN-US#ed_cl#cos(#ed_op#/SPAN#ed_cl#∠#ed_op#SPAN lang=EN-US#ed_cl#ABC)=cos(2X)=2[cos(X)]^2-1=7/25#ed_op#o:p#ed_cl##ed_op#/o:p#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/P#ed_cl##ed_op#P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"#ed_cl##ed_op#SPAN lang=EN-US style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 新細明體"#ed_cl#AC^2=8^2+8^2-2*8*8*cos(2X)=2304/25,#ed_op#/SPAN#ed_cl##ed_op#SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 新細明體"#ed_cl#則#ed_op#SPAN lang=EN-US#ed_cl#AC=48/5#ed_op#o:p#ed_cl##ed_op#/o:p#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/P#ed_cl##ed_op#P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"#ed_cl##ed_op#SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 新細明體; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana"#ed_cl#令∠#ed_op#/SPAN#ed_cl##ed_op#SPAN lang=EN-US style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana"#ed_cl#Y#ed_op#/SPAN#ed_cl##ed_op#SPAN lang=EN-US style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 新細明體"#ed_cl#=#ed_op#/SPAN#ed_cl##ed_op#SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 新細明體"#ed_cl#∠#ed_op#SPAN lang=EN-US#ed_cl#BOC,#ed_op#/SPAN#ed_cl#則#ed_op#SPAN lang=EN-US#ed_cl#cos(Y)=(5^2+5^2-8^2)/2*5*5=-7/25#ed_op#o:p#ed_cl##ed_op#/o:p#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/P#ed_cl##ed_op#P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"#ed_cl##ed_op#SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 新細明體"#ed_cl#則#ed_op#SPAN lang=EN-US#ed_cl#cos(#ed_op#/SPAN#ed_cl#∠#ed_op#SPAN lang=EN-US#ed_cl#AOD)=cos(360#ed_op#/SPAN#ed_cl#度#ed_op#SPAN lang=EN-US#ed_cl#-3Y)=cos(3Y)=4[cos(Y)]^3-3*cos(Y)=11753/15625#ed_op#o:p#ed_cl##ed_op#/o:p#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/P#ed_cl##ed_op#P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"#ed_cl##ed_op#SPAN lang=EN-US style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 新細明體"#ed_cl#AD^2=5^2+5^2-2*5*5*cos(3Y)=7744/625,#ed_op#/SPAN#ed_cl##ed_op#SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 新細明體"#ed_cl#則#ed_op#SPAN lang=EN-US#ed_cl#AD=88/25#ed_op#o:p#ed_cl##ed_op#/o:p#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/P#ed_cl##ed_op#P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"#ed_cl##ed_op#SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 新細明體"#ed_cl#所以#ed_op#SPAN lang=EN-US#ed_cl#AC+AD=48/5+88/25=328/25#ed_op#o:p#ed_cl##ed_op#/o:p#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/SPAN#ed_cl##ed_op#/P#ed_cl##ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#/DIV#ed_cl#