Practice problem
Given an acute angle AAA with sinA=1213\sin A = \frac{12}{13}sinA=1312, compute cosA\cos AcosA.
113\frac{1}{13}131
313\frac{3}{13}133
513\frac{5}{13}135
713\frac{7}{13}137
Type a concept, like “slope” or “photosynthesis”.