Replace variables twice ?

Tran Thien

2018 5 16

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更新时间：2021 8 20

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For example i got these codes

So in dS i want the zx and zy be replaced by diff(...) that i typed before And in zx and zy i want to replace them with rcosphi and rsinphi so the highlighted line in the command window will have rcosphi and rsinphi instead of x and y

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Tran Thien 2018-5-16

编辑：Tran Thien 2018-5-16

Yes But my goal is to solve an intergral in which 'phi' is the variable so I want 'phi's in the highlighted funtion not x and y . I thought if i set x and y like that it will automically replace them with r*cos(phi) and r*Sin(phi) in all my functions