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The board is too far, please bring the camera lil bit closer,please
@@tabassumtonny9810 thanks for your suggestion
![find the family orthogonal to f[z(x+y)2 , x2-y2]=0](http://i.ytimg.com/vi/XYIIvHWM1qk/mqdefault.jpg)
![find the family orthogonal to f[z(x+y)2 , x2-y2]=0](/img/tr.png)
The board is too far, please bring the camera lil bit closer,please
@@tabassumtonny9810 thanks for your suggestion