Error in the denominator, it should be dx not ,dy. [Partial Derivatives part 1. ]

[shivanandmn]

df/dy is wrong, it should be df/dx.

[Isaak_Kamau]

Hello @shivanandmn, Thanks a lot for pointing out the errors, Let me forward them to the officials.
If you come across another bug feel free to start a new topic.
Thank you.