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a/(x+a)-a/(x-a)
by taking lcm we get,
[a(x-a)-a(x+a)]/(x+a)(x-a)
[ax-a²-ax-a²]x²-a²
-2a²/x²-a²
by taking lcm we get,
[a(x-a)-a(x+a)]/(x+a)(x-a)
[ax-a²-ax-a²]x²-a²
-2a²/x²-a²
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