Spherical law of cosines for sides: cos c = cos a * cos b + sin a * sin b * cos C cos c = cos70° cos80° + sin70° sin80° cos100°
Given: A=38°, B=74°, c=12 (side opposite C). Step 1: Find C. C = 180° - (38°+74°) = 68°. Trigonometria plana y esferica de granville solucionario
→ 0.9250 * (-0.1736) = -0.1606
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