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Find expressions for the first five derivatives o…

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Problem 62 Hard Difficulty

(a) If $ F(x) = f(x)g(x). $ where $ f $ and $ g $ have derivatives of all orders, show that $ F" = f" g + 2f'g' + fg". $
(b) Find similar formulas for $ F''' $ and $ F^{(4)}. $
(c) Guess a formula for $ F^{(n)}. $

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Video Transcript

Hey, it's Claire. So ending. Read here. So for part A, we're going to use the first turret, the product roll, to find the first trip it is. And then we're going to use the product roll on both products to find the second derivative turns the derivative of G plus f of x times, a second or a bit of G of X, just equal to the second derivative of friends G of X plus two terms. The first derivative of terms derivative of G plus that F G comes the second derivative of G for part B, we have the equation for the second derivative. We're gonna difference you again to get the third derivative we got. Dream the second derivative drag this. And when we simplify it, we get three times the first derivative of the second derivative of G plus the terms such a threat of dirt derivative of G. We're gonna different. She again me yet I have to. The fourth is equal to this becomes equal Thio to the fourth three plus six back to the second derivative G to the second derivative plus four tongues, the derivative of G character of it. If and then for part C, we see that where we're going to recall the 2nd 3rd and fourth derivatives. And we see the coefficient. So for the half, or the coefficient of each derivative for the seconds we have 1 to 1. For the third, we have 1331 And for the fourth, we have one for six for one. So these are the paschal triangles. And you think if I know meal expression, this is our formula to the n minus K terms G to the key.

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James Stewart

Calculus: Early Transcendentals

Grace He

Heather Zimmers

Caleb Elmore

Joseph Lentino

This textbook answer is only visible when subscribed! Please subscribe to view the answer

Calculus: Early Transcendentals

Grace He

Heather Zimmers

Caleb Elmore

Joseph Lentino

James StewartCalculus: Early Transcendentals

Grace He

Heather Zimmers

Caleb Elmore

Joseph Lentino

James Stewart

Calculus: Early Transcendentals