# How do you find the second derivative of #y=Acos(Bx)#?

##### 1 Answer

Aug 19, 2017

Well, start with the first derivative.

Treat it like the product of two functions:

where

so

and

So, by the product rule, the deriv. of the product

in this case, that works out to

Now, just do it again:

GOOD LUCK!