Expanding formula

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• March 22nd 2010, 02:24 AM
calypso
Expanding formula
Im trying to understand some notes, can someone please explain if the following is the case?

$d/dr [r * da/dr ]$

does this equal

$da/dr + r * d^2a / dr^2$

Thanks

Calypso
• March 22nd 2010, 02:28 AM
sa-ri-ga-ma
Quote:

Originally Posted by calypso
Im trying to understand some notes, can someone please explain if the following is the case?

$d/dr [r * da/dr ]$

does this equal

$da/dr + r * d^2a / dr^2$

Thanks

Calypso

Your calculation is correct.
• March 22nd 2010, 02:34 AM
calypso
Has these being done using the product rule?
• March 22nd 2010, 04:07 AM
sa-ri-ga-ma
Quote:

Originally Posted by calypso
Has these being done using the product rule?

Yes.