Angle Expressed As An Inverse Function Small 320×279 Medium 640×557 Large 1024×891 Download Tiff Original 2400×2089 | (411.1 KB) Description Illustration that can be used to show that when given an angle, expressed as an inverse function of u, it can be used to find the value of any function of the angle in terms of u. Keywords angle, cos, cosine, inverse function, reference, sin, Sine, Tan, tangent, triangles, trig functions, trigonometric, trigonometry Galleries Trigonometry: Triangles Source: George N. Bauer, PH.D. and W.E. Brooke, C.E., M.A. Plane And Spherical Trigonometry (Boston: D.C. Heath & Co., 1917) 74 Courtesy the private collection of Roy Winkelman