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	Online math calculators
		From a factorial polynom in usual online Value of a derivative of a polynomial by Horner's method Quadratic equation with complex coefficients Multiplication of a vector by a matrix online Calculation of value of function of Euler online Polygon triangulation online Equation of the fifth degree online: a special case Expand a fractional polynomial
	Geometric problems and solutions
		Splitting polygon into triangles Mirror display of a point, points through the set straight line Divide the ball into equal volumes by parallel planes To construct the plane on three points Finding of coordinate of the center of gravity of a figure Circle and area cut off by perpendiculars 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
		Planet Jupiter. Coordinates online Visibility of planets and stars over the horizon Azimuth of the Sun and the Moon online
	Online Networking Utilities
		Billion records in ClickHouse Return and additional code of number online Return Polish notation (RPN) online BigBlueButton on the corporate network Jabber server and LDAP catalog
	Section dedicated to chemistry
		Molar mass of substance online Oxides of chemicals Salts of chemicals Bases of chemical compounds 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 Pesticides. Their classification Role of plants in life Criterion for assessing success in science Hardness of substances. Scales and technique Heterotrophic nutrition in plants Paper. General characteristics and its history Morphology of reproductive organs of plants

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