Expanding formula

**calypso** · March 22nd 2010, 02:24 AM

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

**sa-ri-ga-ma** · March 22nd 2010, 02:28 AM

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.

**calypso** · March 22nd 2010, 02:34 AM

Has these being done using the product rule?

**sa-ri-ga-ma** · March 22nd 2010, 04:07 AM

Originally Posted by calypso

Has these being done using the product rule?

Yes.

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