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Update: 21-09-16

Calculator

@mathcalculatorbot

I can calculate arithmetic expressions.

I understand and can calculate:

- arithmetic operations: +, -, *, /
- brackets ( and )
- square root sqrt or √, and squaring sqr
- exponentiation ^
- trigonometric functions sin, cos, tg, ctg, asin, acos, atg, actg
- absolute value abs
- number PI