作者nsr1290 (许喷)
看板trans_math
标题[微分] 102台联大
时间Wed Jul 2 11:14:09 2014
The coordinates of a particle in the xy-plane are differential
function of time t with dx/dt=-1 m/sec dy/dt=-5 m/sec.
How fast is particle's distance form the origin changing as it passes
through the point(5 , 12)?
Thank you!
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