Noori Selina

Disucssion 15

Pick any exercise in Chapter 12 of the calculus textbook. Post the solution or your attempt. Discuss any issues you might have had.

Exercise 12.3.6 Evaluate fx(x,y) and fy(x,y) at the indicated point.

f(x,y)=x3−3x+y2−6y at (−1,3)

f_ <- expression(x**3 - 3*x + y**2 - 6*y) 
x <- -1
y <- 3

f_x <- D(f_, "x")
f_x

## 3 * x^2 - 3

f_y <- D(f_, "y")
f_y

## 2 * y - 6

eval(f_x)

## [1] 0

eval(f_y)

## [1] 0