1.

Let f(x)=int_0^x (cost)/tdt Then at x=(2n+1)pi/2 f(x) has

Answer»

maxima when n=-2,-4,-6,.. and MINIMA when n=-1,3,-5,..
minima when n=-1,-3,-5,… and minima when n=1,3,5,…
minima when n=0,2,4,… and maxima when n=1,3,5,…
none of these

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