sin(x*y)+sin(x^2+y^2)- Images to Visualizing Functions of Two Variables
1. Slope Feld, level Curve, Critical Points, 3D Surface
![1. Slope Feld, level Curve, Critical Points, 3D Surface](https://www.geogebra.org/resource/FeFTMKqd/hgmTGB68mlgRmjNT/material-FeFTMKqd.png)
2. Extrema lines
![2. Extrema lines](https://www.geogebra.org/resource/pDXJNw3E/FQQOh48lov7Z1Wt7/material-pDXJNw3E.png)
3. Contour lines in x-y Plane-Explicit Method, level Curve, , 3D Surface
![3. Contour lines in x-y Plane-Explicit Method, level Curve, , 3D Surface](https://www.geogebra.org/resource/HyJ78xqm/RnHuOkF1V6FQvkP6/material-HyJ78xqm.png)
4. Contour lines in x-y Plane-Explicit Method, Slope Feld
![4. Contour lines in x-y Plane-Explicit Method, Slope Feld](https://www.geogebra.org/resource/SRxKAQXh/VAOXq4yKS8a0BWIW/material-SRxKAQXh.png)
5. Contour lines in x-y Plane--Implicit Method, RGB Colouring
![5. Contour lines in x-y Plane--Implicit Method, RGB Colouring](https://www.geogebra.org/resource/VutcRPPM/DB8OSUJOG6PxPnw3/material-VutcRPPM.png)
6. Contour lines in x-y Plane-Implicit and Explicit Methods, RGB Colouring, Slope Feld
![6. Contour lines in x-y Plane-Implicit and Explicit Methods, RGB Colouring, Slope Feld](https://www.geogebra.org/resource/ZxRuUA8p/IT1zcyEWsuzd6hjP/material-ZxRuUA8p.png)
7. Contour lines in x-y Plane-Implicit Method , HSV Colouring
![7. Contour lines in x-y Plane-Implicit Method , HSV Colouring](https://www.geogebra.org/resource/FnTEVNeG/IjAdYWeyywGSCKeT/material-FnTEVNeG.png)
8. Contour lines in x-y Plane-Implicit Method , HSV Colouring, Extrema lines
![8. Contour lines in x-y Plane-Implicit Method , HSV Colouring, Extrema lines](https://www.geogebra.org/resource/Q8SeZGc2/eA3KR4NCix7pd0I8/material-Q8SeZGc2.png)