(a) With the use of a suitable limit, find the first differential of Vr² +b² with respect to r i.e. differentiate from first principles (where be R). r2+62 r²+a² dy (b) Using suitable differentiation laws, find if y = / (where a, b e R). (c) The parametric equations of a curve a given by r= te-t and y = 2t2 + 1 where t is a parameter, find dy i. dr d?y ii. dr

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