y=ln(a²-x²)
dy/dx=dln(a²-x²)/d(a²-x²)*d(a²-x²)/dx
=1/(a²-x²)*(-2x)
=-2x/(a²-x²)
d²y/dx²=-2*1/(a²-x²)²*[(a²-x²)*1-x*(-2x)]
=-2/(a²-x²)²*(a²-x²+2x²)
=-2/(a²-x²)²*(a²+x²)
=-2(a²+x²)/(a²-x²)²
=-1/(a+x)²-1/(a-x)²
kanbudong
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