How to prove the limit of X multiplied by sin1 / x? I can't understand it. I hope you can give me some advice It is proved by definition that x tends to 0 - and the limit value is 0

How to prove the limit of X multiplied by sin1 / x? I can't understand it. I hope you can give me some advice It is proved by definition that x tends to 0 - and the limit value is 0

It is proved that for any positive number C greater than 0, d = C,
Then 0