∫dx/(x⁴-x²)怎么算?∫dx/x（x²+1）,∫x/cos²x dx ∫dn/(1+eⁿ)²,∫xdx/(x⁴+2x²+5) ,∫dx/x√(a²-x²)
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∫dx/(x⁴-x²)怎么算?∫dx/x（x²+1）,∫x/cos²xdx∫dn/(1+eⁿ)²,∫xdx/(x⁴+2x&#
∫dx/(x⁴-x²)怎么算?∫dx/x（x²+1）,∫x/cos²x dx ∫dn/(1+eⁿ)²,∫xdx/(x⁴+2x²+5) ,∫dx/x√(a²-x²)
∫dx/(x⁴-x²)怎么算?∫dx/x（x²+1）,∫x/cos²x dx ∫dn/(1+eⁿ)²,∫xdx/(x⁴+2x²+5) ,∫dx/x√(a²-x²)
∫dx/(x⁴-x²)怎么算?∫dx/x（x²+1）,∫x/cos²x dx ∫dn/(1+eⁿ)²,∫xdx/(x⁴+2x²+5) ,∫dx/x√(a²-x²)