68. the three-dimensional shape in the diagram on the right is a cube.
what is the degree measure of the angle at point b (the angle formed
by ab and cb).

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Ответ:

xmanavongrove55

31.07.2020

Mathematics

F'(x, y) = 14x +xydy/dx + 14ydy/dx = 0
(xy+14y)|dy/dx = -14x
dy/dx = -14x /(xy+14y)
dy/dx |(x=1,y=1) : -14(1) / (1+14) = -14/15

using
y-y1=/x-x1 = -14/15
y-1/x-1 = -14/15
15y-15 = -14x+14
15y+14x -15-14=0
14x +15y = 29

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68. the three-dimensional shape in the diagram on the right is a cube. what is the degree measure of the angle at point b (the angle formed by ab and cb).