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Add support for trigionometric functions

2

We should ideally add functions like `tan, sin, cos` (and their arc* alternatives) for making the calculator more viable for scientific calculations.

Jacalz

Probably alternating equation & answer (aligned differently?). The history should be either above or to the side, depending on the aspect ratio of the window. (moved from fyne-io/fyne#10)

andydotxyz