# Question #7d154

##### 2 Answers

Dec 14, 2017

#### Explanation:

We know that

Hopefully this helps!

Dec 14, 2017

0

#### Explanation:

If

And the derivative would be zero.

Or, you can have a 'senior moment' like I did, and forget this, for a moment, and go through the motions of actually deriving the function. It's the SUM of terms

So, you'd have

0 (once again).

GOOD LUCK