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\frac{\sqrt{21}\times 3\sqrt{21}}{2\times 14}
Multiply \frac{\sqrt{21}}{2} times \frac{3\sqrt{21}}{14} by multiplying numerator times numerator and denominator times denominator.
\frac{21\times 3}{2\times 14}
Multiply \sqrt{21} and \sqrt{21} to get 21.
\frac{3\times 3}{2\times 2}
Cancel out 7 in both numerator and denominator.
\frac{9}{2\times 2}
Multiply 3 and 3 to get 9.
\frac{9}{4}
Multiply 2 and 2 to get 4.