Xdy-ydx=ydy если x=-1, y=1

Question

Xdy-ydx=ydy если x=-1, y=1

Answer 1

Ответ:

xdy-ydx = ydy, x = -1, y = 1

-1*d*1 - 1*d*(-1) = 1*d*1;

-d - (-d) = d;

-d + d = d

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