Sum of 2 Acute Angles

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Illustration of two triangles, showing the sine of the sum of two acute angles expressed in terms of the sines and cosines of the angles.


George N. Bauer, PH.D. and W.E. Brooke, C.E., M.A. Plane And Spherical Trigonometry (Boston: D.C. Heath & Co., 1917) 61


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