The only way to learn MATHEMATICS is to do MATHEMATICS Trigonometry , the branch of mathematics concerned with specific functions of angles and their application to calculations. There are six functions of an angle commonly used in trigonometry. Their names and abbreviations sine (sin), cosine (cos), tangent (tan), cotangent (cot), secant (sec), and cosecant (csc). The word trigonometry comes from the Greek words trigonon (“triangle”) and metron (“tomeasure”). The first use of the idea of ‘sine’ in the way we use it today was in the work Aryabhatiyam by Aryabhata, in A.D. 500. Aryabhata used the word ardha-jya for the half-chord, which was shortened to jya or jiva in due course. When the Aryabhatiyam was translated into Arabic, the word jiva was retained as it is. The word jiva was translated into sinus, which means curve, when the Arabic version was translated into Latin. Soon the word sinus , also used as sine , became comm
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