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fricas("2+3")
5 
# a mode in SageMathCloud is just a function that takes as input a string.  That's pretty much it (there's more, but).
# For example, this takes whatever the cells input is, executes the code in Fricas,
# then takes the output and displays it using Markdown.
def fricas2(s):
    t = fricas.eval(s)
    md(t, hide=False)

%fricas2

2+3

5

                                                                                                                                                                                                                      Type: PositiveInteger

%fricas2

)set output algebra off
)set output tex on
sqrt(2)

$

sqrt {2}

leqno(13)

$

                                                                                                                                                                                                                           Type: AlgebraicNumber

# it seems that the fricas mode itself is not outputing two $$'s.  I don't know...
fricas.eval("sqrt(2)")
'$\r\r\nsqrt {2} \r\r\nleqno(15)\r\r\n$\r\r\n\r\n Type: AlgebraicNumber\r\r\n'