Alright, the question is:
transform
into by using the substitution
I'm stuck on differentiatin twice
Help, please?
Apply the chain rule. You should have gotten from that
,
as you said it was the second derivative you had trouble with.
The key is to differentiale both sides of the above result with respect to t:
.
Use the product rule:
.
Now apply the chain rule to the remaining derivative:
And you should be able to proceed from here.
--Kevin C.