Question: merging a many radical to a single radical

Hi
I want to say maple convert this radicals to a single radical expr.

cos(sqrt(Lr1+Lr2)*t/(sqrt(Cr)*sqrt(Lr1)*sqrt(Lr2)))

convert to :

cos(sqrt((Lr1+Lr2)/(Cr*Lr1*Lr2))*t)
thank u .

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