Tìm vi phân toàn phần của các hàm số sau:
ln(x+√(x^2+y^2 ) ) ln(sin(y/x))

Let f = ln(x + √(x ² + y ²)) ln(sin(y/x)).

Then the total differential is

look at the picture.

y-intercept for the function on a picture is 4 → point (0, 4).

y-intercept for the function

is for x = 0. substitute:

y-intercept is 8 → point (0, 8).

b, 20 yards

step-by-step explanation: