Please help w/ question on derivatives...its mc so please so i dont need steps...teh q is attached

Question

anonymous · Answer

attachment

anonymous · Answer

are you taking the derivitive of this?

anonymous · Answer

yes

anonymous · Answer

(3-u)(1+u^2)^(-1)=y
(3-u)(-2u(1+u^2)^-2)+(1+u^2)^(-1)(-1)=y'

anonymous · Answer

(3-u)                            1
-------------  -      -------------
-2u(1+u^2)^2                 (1+u^2)

anonymous · Answer

u=x^2-3
3-u=6-x^2
-2u=6-2x^2
1+u^2=x^4-6x+10

anonymous · Answer

6-x^2                                                   1
---------------------          -          ---------------
(6-2x^2)(x^4-6x+1-)^2                          x^4-6x+10

anonymous · Answer

x=3t+3
6-x^2=-9t^2-18t-3
6x=18t+18
x^4=(3t+3)^4

anonymous · Answer

you can finish it from there.

anonymous · Answer

im confused

anonymous · Answer

plug in for x. in the last big equation i gave you.

anonymous · Answer

is it c

anonymous · Answer

none of the asnwer choices look liek wat i got