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# [Help] Differentiating homogeneous function watch

1. Help me out guys, I dont understand the step that they differentiate
f (tx1, ..., txn) to get t f 'i(tx1, ..., txn)

for example you partial differentiate f(5x2+5y2) to get f1=10x ( in this case, t =5 ), the answer in the picture says that it should be t.f1, which is 5.10x=50x ???

Thanks guys
2. bump! help me guys
3. (Original post by than4711)

Help me out guys, I dont understand the step that they differentiate
f (tx1, ..., txn) to get t f 'i(tx1, ..., txn)

for example you partial differentiate f(5x2+5y2) to get f1=10x ( in this case, t =5 ), the answer in the picture says that it should be t.f1, which is 5.10x=50x ???

Thanks guys
Use the chain rule on the function.
is not such a function. . .

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