
অঙ্ক শেখো বাংলায়
\(f (x) = ({{a+x}\over{b+ x}})^{a+b+2x}\) হলে প্রমান করো যে \(f'(0) = [2 log {{a}\over {b } }+ {{b^2 - a^2}\over {ab}}] ({a\over b})^{a+b}\)
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