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1. Basics

Enter expression into input field. Result is shown below as you type.

Touch input field to display cursor handle. Move it to edit parts of the expression.

Use delete buttons to delete characters.

Press enter to add more expressions. One expression per line.

Touch result area and slide finger to move it if result does not fit on the screen. Pinch to zoom in and out.

Touch result to select another expression and edit it.

Press and hold top-right delete button to clear input field.