a. c=85c=85c=85 b. senA=8485sen A=\frac{84}{85}senA=8584, cosA=1385cosA=\frac{13}{85}cosA=8513, tanA=8413tanA=\frac{84}{13}tanA=1384, cscA=8584cscA=\frac{85}{84}cscA=8485, secA=8513secA=\frac{85}{13}secA=1385, cotA=1384cotA=\frac{13}{84}cotA=8413