6) 5(x⁶+1)/x²+1 dx = ?
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it is correct answer . ok by
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5 (x²+1)(6x⁵) - 10(x⁶+1)x / (x²+1)²
== 30x⁷+30x⁵-10x⁷-10x / (x²+1)²
== 20x⁷+30x⁵-10x / (x²+1)²
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