multiply
from the rule
(a - b)(a + b) = a² - b²
3² - (sqrt 2)²
9 - 2
7
divide
3*2 sqrt (a)
6 sqrt (a)
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multiply
from the rule
(a - b)(a + b) = a² - b²
3² - (sqrt 2)²
9 - 2
7
divide
3*2 sqrt (a)
6 sqrt (a)