Question: 1 . Extend the Expression datatype with an operation Double, which takes an expression and doubles it: ( a ) extend the datatype by defining

1.Extend the Expression datatype with an operation Double, which takes an expression and doubles it: (a) extend the datatype by defining an appropriate constructor; (b) extend the compiler to compile Double expressions.
2.Do the same thing for an operation Mult, which takes two expressions and multiplies them together.

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