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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).
Inverse Trigonometric Functions. An inverse trig function allows you to input a number and get an angle measure as an output. Typically, you'll be working in radians when you use inverse trig functions. These functions are read as arc + name of function; for example, the arcsine of x, or sin -1 (x).