# 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.

### Keywords

triangle, angle, triangles, Sine, trigonometry, sin, cos, cosine, trigonometric, trig functions### 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) 61

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