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Maplesoft Document System Tue, 09 Jun 2026 15:30:45 GMT Tue, 09 Jun 2026 15:30:45 GMT The latest answers and comments added to the Question, how to change coordinate system for this equation ? http://www.mapleprimes.com/images/mapleprimeswhite.jpg http://www.mapleprimes.com/questions/128373-How-To-Change-Coordinate-System-For http://www.mapleprimes.com/questions/128373-How-To-Change-Coordinate-System-For?ref=Feed:MaplePrimes:how to change coordinate system for this equation ?:Comments#answer128376 <p>&gt;&nbsp; expr:= diff(f(x,y),x);<br>&nbsp; &nbsp; PDEtools:-dchange({x=r*cos(theta),y=r*sin(theta),f(x,y)=F(r,theta)},diff(f(x,y),x));</p> <p><img src="data:image/png;base64,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" alt=""></p> <p>&nbsp;</p> <p>&gt;&nbsp; expr:= diff(f(x,y),x);<br>&nbsp; &nbsp; PDEtools:-dchange({x=r*cos(theta),y=r*sin(theta),f(x,y)=F(r,theta)},diff(f(x,y),x));</p> <p><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZoAAAA6CAIAAAAGDwhuAAAHXklEQVR4nO2dLXPbTBSFDfojAgoKDQIKDKyZgIDCgICCgACDjqbAwLCgMwHBrwIMAgsKAwIyVkGBgYFhgUGnNjAwDDAIKCjYF2xs62MlXcm7ku7ueUDGcRRrb87N2dXVrrYjAADACjpNNwAAAPRgr52tgn7nFX/SdGOAdqAvSMHVzh4fHx8eHmjHroJ+P1iZbY92Pn/+/Pv376Zb0QxlxBVM9RVuS2wIlnb2/fv3q6urf//+UX9h4rPrwdfr9enp6Xq9brohdVNaXMFSX+GwxObgZ2eLxaLX6728vBQd+Ho10g9WTPvv2WzW7XYJkdoDWVxhgb7CSYmNws/OLi8vKUN0mez9YLWrsTDsvoUYDofj8bjpVtQHUVxhi77CPYmNwszOfv369enTJ8KB+2zff8cy3bfb7fv378tdebGFLK6wRl/hmMSmYWZno9Ho58+fhAMnfrTHZnsxIoQYDAaz2azpVtQBWVxhk77CJYlNw8zOer3e8/Mz4cBU78218xb39/d3d3dNt6IOyOIKm/QVLklsmjrsbDqdUtQajUarVUEX2+12iSeN5vvE19x3EyOiUBj14+Pj9fW1lnOZoBFxhWF9BSTmiXE7WywWHz58oNy7eX5+Pjs72263WQdsNpuzszP6qeUFifYqMT0iCoVRz2az8/NzLefSToPiCmP6CkjMFuN2dn5+/uPHD+LBNzc3Nzc3WT+dz+dXV1d6mnUEpSKikB/1er0uNWzRwTLwOl6wLDzOPnElDkhsJ2btbDabnZycKO7a7DrWRL+63W5PTk6y+rHpdDoYDMy0NEa46/ZjeMEyJyIKlaJer9fv3r2rcrrqkOyMqbgS5yW2E7N29vXr18vLy+S7h/tQijtS3W736elJ+Wl1Znzodzp+uP92GXjy31sdEYWqUbc21/mKK4HE9mHWzi4uLr58+ZJ4M1a4Td2Turi4uL29VX5ajRm/DLxdqoe+H+6+ZkREoXLUrc11tuJKILGFUOxsGXj7ZxeEyfci1ySRAfzrcW/fvr2/v49/WmJ9XXK53WAw+Pjxo7Id9WX8IdWXgRfpwZURvf4pvGApX8aO31E9anWuk05KJSlc9BNfX+/0jpyHq7iS9ksMylNoZ7FObOdeof/6IiJuJCuWQSBfvXnz5tu3b/EPnKSqFknVs+7y1JbxEf/uJGpIqoiEEKHvBWHgeb7vqWtO1aPOzvXCk9KICzeJGtfhD+EFy2RJjam4EiYSg3IU2dneuCLEsnrvcTJB4v1Wp9NRZXxkTD7xdWV8MpfIpD4pEl+y51ZGJEToe77v51lK9agzcz3zpOn/qwjpGVoK4aJlpcTrQzawEJe3xKAkBXamvMV1GKUljth3ebv8UHV08fV18RwQbejA424dxKNXdt2h73m5mX5M1Fm5TjgpmaRwOXZ28D2W4kqYSAzKQhidpSoFsfJB5GI0+mOZLKrySkzo9Nrh5ssrqgHpHlVEub+wo3LUGblOOmk5DsKR7IyluBIeEoPSFNbOQj96JSKrYhHDilZUg8h9AvlT9U2i/Th8FfRTM3SavvlVMOVKEVHokwrxVaNW5zrxpBQUwpHsjKG4EiYSg/JQ7mxGbnzFSmbxd6LF1Z32mVN4MmYbimanJqkCTZCOKFF7kZ+hTv5KUStzPVXwOYKkcIeb1v/9id7ATkrOTFwJH4lBBRpaFZCBnonjJjfFoEWULMfkw3TKeDPimgcS84XTms3yGW/kOVj5EVWYBVa4oK+1ud6ouAaBxEzh9ESNKhlvYFOMmh+30OZcb0DcnKF39oVeWSAxUzg972w+n9MeC6XaFEPrNPo6H4a1Wq3a/LgFXeIeO/TOXS9ZgTolhp3pgtPTaDebDeWxUNmbYmiaRl8vjjwM68ihd/56yZYDO9MFJzsTQpyenhYdkr0pRvHE7jby8PDgwqNKyXam3I+uYL1ky4Gd6YKZnRE2YczcFEPnNPoaGY/HLjxInlhJyBh6F6yXbDktrycwgpmdjUaj6XSae0jWphgGptHXgiPb/NAqCVlD74L1ki3HkXpCDTCzs/l8XnhJot4UQ+M0+hp5eXlxZxNGQiUha+hdsF6y5ThST6gBZnYmhOj3+4V7AqU3xdA5jb5GhsOh6mE1dkKoJGTuR5e/XrLlOFJPqAF+djafz3u93t+/f5tuiHHkNYgjQzNBqiRk70eXu16y5ThST6gBfnYmhLi9vR0Oh023wiyLxaLX6202m6YbUh+USoLI2Y9O3zTaOnGqnmAalnYmhBiPx3q3Dmsbg8HAKS+TUCoJluFUPcE0XO0MWIk7lQSJa/UE08DOQLtwoZIgcbCeYBrYGWgd1lcSJG7WE4wCOwMAWILazpIrRgAAtVOzF1gA/mQAAEuAnQEALAF2BgCwBNgZAMASYGcAAEuAnQEALAF2BgCwBNiZXWjdsAoAXsDO7IPlhlUAHA/szDp4blgFwPHAzmyD6YZVABwP7MwyuG5YBcDxwM7sgueGVQBoAXZmFUw3rAJAC7AzAIAlwM4AAJYAOwMAWML/GkjsQrhql60AAAAASUVORK5CYII=" alt=""></p> <p>&nbsp;</p> 128376 Mon, 05 Dec 2011 04:52:39 Z Robert Israel Robert Israel http://www.mapleprimes.com/questions/128373-How-To-Change-Coordinate-System-For?ref=Feed:MaplePrimes:how to change coordinate system for this equation ?:Comments#comment128384 <p>mercccccccccccccccccccccc &nbsp;<a href="http://www.mapleprimes.com/users/Robert%20Israel">Robert Israel</a>&nbsp;</p> <p>mercccccccccccccccccccccc &nbsp;<a href="http://www.mapleprimes.com/users/Robert%20Israel">Robert Israel</a>&nbsp;</p> 128384 Mon, 05 Dec 2011 12:53:03 Z aryan_ams aryan_ams