10. Use as propriedades dos logaritmos para simplificar as expressões: a) ln sen θ − ln (sen θ / 5) b) 3 ln 3 / √(t2 − 1)− ln (t+ 1)

a) ln sen θ − ln (sen θ / 5) = ln (sen θ / (sen θ / 5)) = ln 5 b) 3 ln 3 / √(t2 − 1)− ln (t+ 1) = ln [(3/√(t2 − 1))^3 / (t+ 1)] = ln [(27(t-1))/(t+1)√(t2 − 1)]