## S3 method for class 'yacas':
Eval(x, envir = parent.frame(), ...)
## S3 method for class 'Sym':
Eval(x, envir = parent.frame(), ...)
Eval(yacas(expression(x*x)), list(x=2))
# same
x <- 2
Eval(yacas(expression(x*x)))
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