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The simplified form of the expression is:
3 * sqrt(5c) * sqrt(15c^3)
= 3 * sqrt(5c * 15c^3)
= 3 * sqrt(75c^4)
= 3 * sqrt(25 * 3 * c^4)
= 3 * 5c^2 * sqrt(3)
= 15c^2 * sqrt(3)