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Which of the following is/are true? (a)...

Which of the following is/are true? (a)`lim_(x->oo)((2+x)^(40)(4+x)^5)/((2-x)^(45))=1` (b) `lim_(x->0)(1-cos^3x)/(xsinxcosx)=3/2` (c) `lim_(x->0)(ln(1+2x)-2"ln"(1+x))/(x^2)=-1` (d)`lim_(x->oo)(cot^(-1)(sqrt(x+1)-sqrt(x)))/(sec^1((2x+1)/(x-1)^2)=1`

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