div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imageimg data-url=document17-arctan-205-18-xdx-ydy-r-sin-9-4-df-arctan-dxdy-r-cos-9-4-d9f-9rdrhtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: cdn035yun-imgcomcdn035yun-imgcomstaticuploadafanedudownload · 17 arctan #205} 18 xdx + ydy r sin 9 4 dÐf arctan dxdy = r cos 9 4 d9f 9rdr= 4 dB -{12 xlnx-+- loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader030fdocumentsfrreader030viewer20220404095ec0b82046da7f437d22cf4chtml5thumbnails1jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=2Page 2button div class=trans-imageimg data-url=document17-arctan-205-18-xdx-ydy-r-sin-9-4-df-arctan-dxdy-r-cos-9-4-d9f-9rdrhtmlpage=2 data-page=2 class=trans-thumb lazyload alt=Page 2: cdn035yun-imgcomcdn035yun-imgcomstaticuploadafanedudownload · 17 arctan #205} 18 xdx + ydy r sin 9 4 dÐf arctan dxdy = r cos 9 4 d9f 9rdr= 4 dB -{12 xlnx-+- loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader030fdocumentsfrreader030viewer20220404095ec0b82046da7f437d22cf4chtml5thumbnails2jpg width=140 height=200 divdivdiv class=trans-pagebutton class=gotoPage data-page=3Page 3button div class=trans-imageimg data-url=document17-arctan-205-18-xdx-ydy-r-sin-9-4-df-arctan-dxdy-r-cos-9-4-d9f-9rdrhtmlpage=3 data-page=3 class=trans-thumb lazyload alt=Page 3: cdn035yun-imgcomcdn035yun-imgcomstaticuploadafanedudownload · 17 arctan #205} 18 xdx + ydy r sin 9 4 dÐf arctan dxdy = r cos 9 4 d9f 9rdr= 4 dB -{12 xlnx-+- loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader030fdocumentsfrreader030viewer20220404095ec0b82046da7f437d22cf4chtml5thumbnails3jpg width=140 height=200 divdivdiv...