We shall use:
Product rule
`(u cdot v)'=u' cdot v+u cdot v'`
Chain rule
`(u(v))'=u'(v) cdot v'`
`u` and `v` are both functions of arbitrary variable over which we are differentiating.
First we apply product rule.
`f'(t)=(t^(3/2))' log_2 sqrt(t+1)+t^(3/2)(log_2 sqrt(t+1))'=`
Now we apply the chain rule on the second term.
`3/2 t^(1/2)log_2 sqrt(t+1)+t^(3/2) 1/(sqrt(t+1)ln 2)cdot1/(2sqrt(t+1))=`
Now we simplify the obtained derivative to get the final result.
`3/2 sqrt(t)log_2 sqrt(t+1)+t^(3/2)/(2(t+1)ln2)`
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