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what is the structure of elaidic acid ...
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∫ x.tan x . dx ...
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\hspace{-16}\bf{(1)\;\;\int \left(\frac{x^2-1}{x^2+1}\right).\frac{1}{\sqrt{x^4+1}}dx}$\\\\\\ $\bf{(2)\;\;\int \left(\frac{x^2+1}{x^2-1}\right).\frac{1}{\sqrt{x^4+1}}dx}$\\\\\\ $\bf{(3)\;\;\int \frac{\sqrt{x^4+1}}{x^4-1}dx}$\ ...
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\hspace{-16}\bf{(1)\;\;\int \left(\frac{x^2-1}{x^2+1}\right).\frac{1}{\sqrt{x^4+1}}dx}$\\\\\\ $\bf{(2)\;\;\int \left(\frac{x^2+1}{x^2-1}\right).\frac{1}{\sqrt{x^4+1}}dx}$\\\\\\ $\bf{(3)\;\;\int \frac{\sqrt{x^4+1}}{x^4-1}dx}$\ ...
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∫ ln(x-1)/x ? ...
