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Q.

The set of points of discontinuity of the function ⨍ (x)=Ltn(2sin x)2n3n-(2cos x)2n is

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a

/nZ

b

±π/6/nZ

c

±π/2/nZ

d

±π/3/nZ

answer is B.

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Detailed Solution

f(x)=limn2 sin x2n3n-2 cos x2n is discontinuous if 3n-2 cos x2n=0 4 cos2xn=3n cos2x=34=cos2π6 x=±π6; nz

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