Trigonometric formula 2nd step

I shall post trigonometric identity, properties of triangle and other related to trigonometry also in few days.

Trigonometric formula introduction only

           1st of all I want to give a short introduction of trigonometry. In this section i shall give you very easily understandable word that help u to learn more and more from root to the top of Trigonometry.

        Trigonometry is the part of mathematical science that help us to measure three sides and three angles in a triangle. In other word Trigonometry is a system that help us to work on missing side or angle in a triangle. The father of trigonometry is known as Hipparchus a Greek astronomer who lived between 190-120 B.C. He also developed 1st accurate star map.
    According to me meaning of Trigonometry is
             Tri = Three
             gono= gunia= angle
             metry= measurement
            

Algebraic formulae