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	Online math calculators
		Calculation of value of function of Euler online Properties of determinant of a matrix Polynomial and matrix as an argument Polynomial and matrix as argument System of diophantine linear equation online To find number on a remainder of division Complex inverse matrix online From a factorial polynom in usual online
	Geometric problems and solutions
		Dissecting a circle with straight lines into equal areas Finding of coordinate of the center of gravity of a figure Mirror display of a point, points through the set straight line To construct the plane on three points Divide the ball into equal volumes by parallel planes Splitting polygon into triangles Circle and area cut off by perpendiculars
	Geographic online calculations and definitions

	Working with text and line data
		To mix letter online in the text
	Astronomical and astrological calculations and data
		Visibility of planets and stars over the horizon Planet Jupiter. Coordinates online Azimuth of the Sun and the Moon online
	Online Networking Utilities
		Return Polish notation (RPN) online BigBlueButton on the corporate network Jabber server and LDAP catalog Return and additional code of number online Billion records in ClickHouse
	Section dedicated to chemistry
		Oxides of chemicals Indicators of chemical reactions Molar mass of substance online Bases of chemical compounds Salts of chemicals
	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 Paper. General characteristics and its history Morphology of reproductive organs of plants Criterion for assessing success in science Heterotrophic nutrition in plants Hardness of substances. Scales and technique Role of plants in life Calculation of percent online

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