{(y² - 4)/(x² - 1)} × {(x³ - x)/(y³ + 2y²)} = কত?

প্রশ্ন: {(y² - 4)/(x² - 1)} × {(x³ - x)/(y³ + 2y²)} = কত?

সমাধান:
(y² - 4)/(x² - 1) × (x³ - x)/(y³ + 2y²)
= (y + 2) (y - 2)/(x² - 1) × {x(x² - 1)/y²(y + 2)}
= (y + 2) (y - 2)/(x + 1) (x - 1) × {x (x + 1)(x - 1)/y²(y + 2)}
= x (y - 2)/y²