3√3 * 3√5-3√5*√2-3√3*√7+√7*√2
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ans. √14
exp: 3√3 × 3√5 - 3√5 × √2 - 3√3 × √7 +√7 × √2
= 3√5 - 3√5
= 0
= 3√3 × 0 × √2 - 3√3 × √7 + √7 × √2
=0 + √7 × √2
= √7×2
= √14
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