Evaluate :(3x- 1/2y) (3x+1/2y)
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(3x-1/2y)(3x+1/2y)
as (a-b)(a+b)=a^2-b^2
(3x)^2 - (1/2y)^2
9x^2 -1/4y^2
as (a-b)(a+b)=a^2-b^2
(3x)^2 - (1/2y)^2
9x^2 -1/4y^2
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