Multivariable Calculus With Analytic Geometry,: ...

Sora began at the base. To find the fastest way up, she used her . "The gradient vector

Near the summit, Sora reached a strange clearing. To her left and right, the ground rose like high walls. In front and behind, the ground dropped off into deep canyons."A ," she whispered. Her compass spun wildly; the slope was zero, but she wasn't at the top. She used the Second Derivative Test . By calculating the discriminant ( Multivariable Calculus with Analytic Geometry, ...

She invoked the . She looked for the spot where the gradient of the mountain was perfectly parallel to the gradient of the fence ( Sora began at the base

). At that precise alignment, she found the maximum elevation allowed by the law. The Analytic View the slope was zero