Quotient Rule for Differentiation

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Let the function $u$ be defined by $u(t)=\frac{t}{t+1}$ . Which of the following is $u'(t)$ ?

$u'(t)=\frac{-1}{(t+1)^2}$

$u'(t)=\frac{1}{(t+1)^2}$

$u'(t)=\frac{1}{t+1}$

$u'(t)=\frac{t}{(t+1)^2}$

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