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d operator and dtang operator

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Hi, is there any one knowing the difference between the operator d(f,x) and the operator dtang(f,x). When I use the d(f,x) operator in COMSOL 5.3a, there is an error. But when I use dtang(f,x) instead, it works out. can someone tell me the difference between these two operators?


0 Replies Last Post 2018年8月10日 GMT-4 02:13
COMSOL Moderator

Hello zhao yang

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