Find the differential of each question.(my answers are given but both are wrong)

A)y=x^2sin4x
i did:
y`=2x sin4x + 4 cos4x x^2
y`=2x sin4x + 4x^2 cos4x (wrong)

B)y=(sqrt)2+t^2 and yes square root of whole thing
then my answer is y`=t/(2+t^2)^1/2 which is wrong.

Please help!

Question

Find the differential of each question.(my answers are given but both are wrong)

A)y=x^2sin4x
i did:
y`=2x sin4x + 4 cos4x x^2
y`=2x sin4x + 4x^2 cos4x (wrong)

B)y=(sqrt)2+t^2 and yes square root of whole thing
then my answer is y`=t/(2+t^2)^1/2 which is wrong.

Please help!

loser66 · Answer

A) is completely right

primeralph · Answer

Differential?

anonymous · Answer

im guessing i have to add dx at the end?

loser66 · Answer

B) the problem is unclear. What does (sqrt)^2 mean?

anonymous · Answer

(sqrt)2+T^2 and with A) i added the dx at the end and my practice quiz is still showing its wrong.

loser66 · Answer

http://www.wolframalpha.com/input/?i=%28x^2sin%284x%29%29%27

primeralph · Answer

*Derivative, not differential.

loser66 · Answer

use the draw box below to write B again. I don't get it

anonymous · Answer

Not derivative, it's suppose to be differential

anonymous · Answer

|dw:1393644524589:dw|