How to convert square wave to sine wave?

A square wave can be changed into a sine wave by either active filtering recomended or passive filtering.

How to convert square wave 2 sine wave. I would like to convert a square wave that I made using a 555 into a sine wave. It can include ICs, diodes, resistors, transistors and capacitors but I don't want to use a filter or something else and I would like it to be low cost.

If it is not easy I would like a circuit which will make a sine wave directly. It can contain the items mentioned above and has to be low cost. The frequency range is between 50Hz to 600KHz max.

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