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提供一種解法:Z=X2-Z2且切平面過(3,5,4)Z'x=2X =6,在Y= 5這個平面(Z-X)上導數為6,∴可以得到一條切線,方向向量可以是(1,0,6),且過切點(3,5,4)Z'y=2Y=10,在X= 5這個平面(Z-Y)上導數為10,∴可以得到另一條切…
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