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List of trigonometric identities

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In mathematics, trigonometric identities are equalities that involve trigonometric functions and are true for every single value of the occurring variables. Geometrically, these are identities involving certain functions of one or more angles. They are distinct from triangle identities, which are identities involving both angles and side lengths of a triangle. Only the former are covered in this article. These identities are useful whenever expressions involving trigonometric functions need to be simplified. An important application is the integration of non-trigonometric functions: a common technique involves first using the substitution rule with a trigonometric function, and then simplifying the resulting integral with a trigonometric identity. Useful trig formulas  for learning trigonometric concepts. Triangle ABC is any triangle with side lengths  a,b,c Law of Cosines Law of Sines   Pythagorean identity The basic relationship between the sine and the c
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Introduction to Coordinate Geometry

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What are coordinates In classical mathematics, analytic geometry, also known as coordinate geometry, or Cartesian geometry, is the study of geometry using a coordinate system and the principles of algebra and analysis. This contrasts with the synthetic approach of Euclidean geometry, which treats certain geometric notions as primitive, and uses deductive reasoning based on axioms and theorems to derive truth. Analytic geometry is widely used in physics and engineering, and is the foundation of most modern fields of geometry, including algebraic, differential, discrete, and computational geometry. Usually the Cartesian coordinate system is applied to manipulate equations for planes, straight lines, and squares, often in two and sometimes in three dimensions. Geometrically, one studies the Euclidean plane (2 dimensions) and Euclidean space (3 dimensions). As taught in school books, analytic geometry can be explained more simply: it is concerned with defining and representing geom
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Basic arithmetics math formulas

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TIME AND DISTANCE                       Speed, Time and Distance: Speed = Distance , Time = Distance , Distance = (Speed x Time). Time Speed km/hr to m/sec conversion: x  km/hr = x  x 5 m/sec. 18 m/sec to km/hr conversion: x  m/sec = x  x 18 km/hr. 5 If the ratio of the speeds of A and B is  a  :  b , then the ratio of the the times taken by then to cover the same distance is 1 : 1 or  b  :  a . a b Suppose a man covers a certain distance at  x  km/hr and an equal distance at  y km/hr. Then, the average speed during the whole journey is 2 xy km/hr. x  +  y
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