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Constants

Constants
is an option for Dt which gives a list of objects to be taken as constants.
  • If f appears in the list of Constants, then both Dt[f] and Dt[f[...]] are taken to be zero.
Here both a and b are assumed to depend on x:
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Specify that a does not depend on x using the Constants option:
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Specify that both a and b are independent of x:
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