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IF u=x^2+y^2 and x=s+3t,y=2s-t, then-...

IF u=`x^2+y^2` and x=s+3t,y=2s-t, then-

A

`dx/(ds)=1`

B

`dy/(ds)=2`

C

`(d^2u)/(ds^2)=10`

D

`(d^2y)/(ds^2)=0`

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A, B, C, D
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