Higher Secondary Question Paper Solution of Year 2014 Question No: D.(4)(c)(i)

\(f (x) = x + sin \ x\) যখন \(x < 0\)

        = 0,  যখন \(x \geq 0\)

হলে, x = 0 তে f'(x) সন্তত কিনা পরীক্ষা করো ।

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