Quotient Rule for Differentiation
Let the function $$u$$ be defined by $$u(t)=\frac{t}{t+1}$$. Which of the following is $$u'(t)$$?
A
$$u'(t)=\frac{-1}{(t+1)^2}$$
B
$$u'(t)=\frac{1}{(t+1)^2}$$
C
$$u'(t)=\frac{1}{t+1}$$
D
$$u'(t)=\frac{t}{(t+1)^2}$$
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