设x=cost y=sint-tcost 求dy/dx
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设x=cost y=sint-tcost 求dy/dx
设x=cost y=sint-tcost 求dy/dx
设x=cost y=sint-tcost 求dy/dx
dy/dx= y'/x'= tsint/(-sint)=-t
设x=cost y=sint-tcost 求dy/dx
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{x=e右上角tcost,则 dy/dx = {y=e右上角tsint,不好意思大括号 打不出来,只好用两个括号{x=e右上角t cost, {y=e右上角t sint, 则 dy/dx = {,
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