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The development of modern trigonometry shifted during the western Age of Enlightenment, beginning with 17th-century mathematics (Isaac Newton and James Stirling) and reaching its modern form with Leonhard Euler (1748).
Trigonometric functions are used to calculate the internal angles of triangles. Trigonometric functions are sine function, cosine function, tangent function, cotangent function, cosecant function and secant function.These functions give a definite value of angles in certain degrees. We can find the trigonometric functions of any angle.rigonometric functions are sine function, cosine function, tangent function, cotangent function, cosecant function and secant function. These functions give a definite value of angles in certain degrees.