The number π (/paɪ/; spelled out as pi) is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulas across mathematics and physics. It is an irrational number, meaning that it cannot be expressed exactly as a ratio of two integers, although fractions such as 22/7 are commonly used to approximate it.

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The calculator allows to use most of the trigonometric functions, it is possible to calculate the cosine, the sine and the tangent of an angle through the functions of the same name.. The

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