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	Online math calculators
		Polynomial and matrix as argument The area of a polygon on coordinates Value of a derivative of a polynomial by Horner's method Build a polynomial in degree Universal calculator of complex numbers online Matrix and characteristic equation Expand a fractional polynomial Formulas of the sums of a number of natural numbers in integer degree
	Geometric problems and solutions
		Divide the ball into equal volumes by parallel planes Circle and area cut off by perpendiculars To construct the plane on three points Mirror display of a point, points through the set straight line Splitting polygon into triangles Finding of coordinate of the center of gravity of a figure Dissecting a circle with straight lines into equal areas
	Geographic online calculations and definitions

	Working with text and line data
		To mix letter online in the text
	Astronomical and astrological calculations and data
		Azimuth of the Sun and the Moon online Visibility of planets and stars over the horizon Planet Jupiter. Coordinates online
	Online Networking Utilities
		BigBlueButton on the corporate network Billion records in ClickHouse Return and additional code of number online Return Polish notation (RPN) online Jabber server and LDAP catalog
	Section dedicated to chemistry
		Salts of chemicals Molar mass of substance online Bases of chemical compounds Oxides of chemicals Indicators of chemical reactions
	Online calculations for electrical engineering and electricity

	Calculators and articles on medical topics
		Classification of nutritional supplements Vitamins Short description and application
	Articles on abstract topics
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	The world around us
		Concepts of synoptic meteorology Heterotrophic nutrition in plants Criterion for assessing success in science Pesticides. Their classification Calculation of percent online Role of plants in life Paper. General characteristics and its history Sound and acoustic units of measure

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