a-¹/a-¹ + b-¹ - a-¹/a-¹ - b-¹
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Answer:
a-¹/(a-¹ + b-¹ ) + a-¹/( a-¹ - b-¹) = 2b²/( b² - a²)
LHS = a-¹/( a-¹ + b-¹) + a-¹/( a-¹ -b-¹)
= 1/a/( 1/a + 1/b ) + 1/a/( 1/a - 1/b)
= ab× 1/a/( b + a) + ab × 1/a /( b - a)
= b/( b + a) + b/( b - a)
= b{ 1/( b + a) + 1/( b -a) }
= b{ 2b/( b² - a²) }
= 2b²/( b² - a²) = RHS
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