不太懂它的題意耶...
1. Find the area of the largest rectangle that can be inscribed
in a semicircle of radius r.
2. Find the equations of the tangent plane and normal line to
the surface sin(xyz) = x + 2y + 3z at the point (2,-1,0).
小弟我英文不是很好...看不是很懂 一.一川
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