(1/36)² a²b² - (16/49)² b²c²
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a^2 - b^2 = (a - b) (a + b)
(1/36ab)^2 - (16/49bc)^2
(ab/36 - 16bc/49) (ab/36 + 16bc/49)
(1/36ab)^2 - (16/49bc)^2
(ab/36 - 16bc/49) (ab/36 + 16bc/49)
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