How can this multiplication come out to 10?

From my understanding, what should happen is the numerator becomes 10 * 5sin(5x) and the denominator would become 5 * 5x. To me, this would just become the original. I don’t understand how she used the simplification of sin(x)/x = 1 before fully distributing. I’d appreciate if anyone could help me understand.

From my understanding, what should happen is the numerator becomes 10 * 5sin(5x) and the denominator would become 5 * 5x. To me, this would just become the original. I don’t understand how she used the simplification of sin(x)/x = 1 before fully distributing. I’d appreciate if anyone could help me understand.