Simplifying this function: $\ddot x=\frac{l\sin(t)-\sin(\sin(t))g}{\cos(\sin(t))}$ .

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How to simplify this? (only the right side)

$$\ddot x=\frac{l\sin(t)-\sin(\sin(t))g}{\cos(\sin(t))}$$

$\ddot x$ is a function of $t$
$l$ and $g$ are constants.