Negative Cotangent Angles Small 320×139 Medium 640×277 Large 1024×444 Download Tiff Original 2400×1040 | (191.1 KB) Description Illustration that can be used to show that if the cotangent of an angle is negative the angle must terminate in either the second or fourth quadrant. Keywords angle, cot, cotangent, inverse function, negative angles, reference, Tan, tangent, trig functions, trigonometric, trigonometry Galleries Trigonometry: Angles Source: George N. Bauer, PH.D. and W.E. Brooke, C.E., M.A. Plane And Spherical Trigonometry (Boston: D.C. Heath & Co., 1917) 80