Via the Scalar Multiple rule, we can treat this as
.We can go a step further and consider it as involving a quantity u:
Derivative of the sine of a linear quantity:
Via the Scalar Multiple rule, we can treat this as .
We can go a step further and consider it as involving a quantity u:
, where 
.
When we eventually apply the Chain Rule, we'll need 
.
Combining these partial results and using the derivative of the sine, we get
.
Finally, we substitute for u:
