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- -module(first).
- -export([double/1,mult/2,area/3,square/1,treble/1]).
- mult(X,Y) ->
- X*Y.
- double(X) ->
- mult(2,X).
- area(A,B,C) ->
- S = (A+B+C)/2,
- math:sqrt(S*(S-A)*(S-B)*(S-C)).
- square(X) ->
- mult(X,X).
- treble(X) ->
- mult(X,3).
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