factorise 9/16-36 y2
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= 9/16 - 36y²
= (3/4)² - (6y)²
a²-b² = (a-b)(a+b)
= (3/4 - 6y) (3/4 + 6y)
= (3/4)² - (6y)²
a²-b² = (a-b)(a+b)
= (3/4 - 6y) (3/4 + 6y)
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