One can input integer numbers in the common way, for example:
4; 18; 56

To input the negative number it is necessary to put the minus sign before the number:
-19; -45; -90

Rational numbers are entered by means of the
/ symbol, for instance:
3/4;-5/3;5/(-19)

Decimal numbers can be entered by using the dot as the separator of integer and decimal parts of the number:
4.5;-0.4

Variable and constants are entered be means of latin letters, for example:
x; y; z; a; b.

Constants
π
and
e
can be input as pi and e - correspondingly.

Infinity symbol
∞
is entered with two small oo latin latters or by means of the
inf.

The plus infinity and the minus infinity are entered as +oo and -oo correspondingly.

Addition and subtraction are entered by means of the + and - signs correspondingly, for instance: 3+a; x+y; 5-4+t; a-b+4; ATTENTION! No spaces are needed between the operands, for example the input: x + a - wrong, right input is x+a - without the spaces.

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