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đạo hàm ẩn d2ydx2,x3+y3=4
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Solution
d2ydx2=−2x(x3+y3)y5
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x3+y3=4
Coi y như y(x)
Phép lấy vi phân tìm đạo hàmdydx của x3+y3=4:−x2y2
dydx=−x2y2
Phép lấy vi phân tìm đạo hàmd2ydx2 của dydx=−x2y2:−2x(−xdydx+y)y3