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Por teorema de Pitágoras H^2 = C.A^2 + C.O^2
5^2 = 3^2 + C.O^2 ..... C.O = 4
Piden : cscb = H/C.O = 5/4
cotb = C.A/C.O = 3/4
5/4 + 3/4 = 8/4 = 2