Answer
$s=t+\sin t+4$
Work Step by Step
The anti-derivative for $\dfrac{ds}{dx}=1+\cos t$ is $s=t+\sin t+C$
Apply the initial conditions $s(0)=4$ to get the value of $C$.
This implies, $4=0+\sin 0+C$ or, $ C=4$
Hence, $s=t+\sin t+4$
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