y=1/2·x·√(ln[x+²√(x²﹢a²)],求dy/dx及d²y/dx².

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y=1/2·x·√(ln[x+²√(x²﹢a²)],求dy/dx及d²y/dx².y=1/2·x·√(ln[x+²√(x²﹢a&#

y=1/2·x·√(ln[x+²√(x²﹢a²)],求dy/dx及d²y/dx².
y=1/2·x·√(ln[x+²√(x²﹢a²)],求dy/dx及d²y/dx².