To calculate: The simplification , by multiplication or division , of the expressions given below:a)\sqrt{15y} \cdot \sqrt{21y}

To calculate: The simplification , by multiplication or division , of the expressions given below:
a) $$\displaystyle\sqrt{{{15}{y}}}\cdot\sqrt{{{21}{y}}}$$
b) $$\frac{\sqrt[3]{625c^2d^{10}}}{\sqrt[3]{5c^5d}}$$

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