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You mean \[f_x, f_y, \enspace \text{and}\enspace f_{xxy}\]
right?

Does that make sense to you? :)

I figured out my mistake but whats fxxy?

OK, so for f_y we will get the following

brb

i solved for f_y but I cant seem to figure out what f_xxy is supposed to be

kk

im sorry but can you explain that a little better im still confused

http://www.youtube.com/watch?v=2ZwdHLbmFJs
fast forward to 22:15

thank you but the answer is wrong :(

@agent0smith d you have any idea on how to solve for the last part?

Were you able to solve the first two parts? :o

yes i did but i cant seem to figure out the last part

Yah Jvatsim made a tiny mistake on his last derivative, let's continue from \(f_{xx}\).

ok thank you

For the next part, we have two functions of `y`, so we have to apply the product rule.

ok but how would we do that

yea i do thanks

for the second part would you consider x as a constant

Yes c: You'll end up applying the chain rule after you take the derivative of the sine portion.

So yah the x being a constant is important to remember c:

so the second part would be xcos(xy)?

(−8y)sin(xy)−4xy^2[cos(xy)]

yes good.

so would that be the answer?

haha i ddnt forget thank you sooo much!