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Substituting function value in an expression

I have an expression like uR(t) == 3*iL(0) + uC(0)/2 - 4 how can I substitute for iL(0) and uC(0), if I'm given, that iL(0) = 0 and uC(0) = 0.

uR, iL, uC are a functions of var t:

t = var('t')
uR = function('uR', t)
iL = function('iL', t)
uC = function('uC', t)

Substituting function value in an expression

I have an expression like uR(t) == 3*iL(0) + uC(0)/2 - 4

how can I substitute for iL(0) and uC(0), if I'm given, that iL(0) = 0 and uC(0) = 0.

uR, iL, uC are a functions of var t:

t = var('t')
uR = function('uR', t)
iL = function('iL', t)
uC = function('uC', t)

thank you :)