Answer
$sin$ $2x$ $=$ $2$ $sin$ $x$ $cos$ $ x$
Work Step by Step
Using the double angle formula of sine
we have: $sin$ $ 2$ $ A$ $=$ $2$ $sin$ $A$ $cos$ $A$
Next we change the $A$ to $x$,
and we get: $sin$ $ 2$ $ x$ $=$ $2$ $sin$ $x$ $cos$ $x$