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y' = 3(4x^2 + 5 )^2 . 8x
= 24x (4x^2 + 5 )^2 (d)
2). y = (x^2 + 1)^(-1)
y' = -1(x^2 + 1)^(-2) . 2x
=-2x (x^2 + 1)^(-2)
=
3).