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If fx=sgnx2-ax+1 has maximum number of points of discontinuity then

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By Expert Faculty of Sri Chaitanya
a
a∈2,∞
b
a∈-∞,-2
c
a∈-2,2
d
none of these

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detailed solution

Correct option is A

For maximum points of discontinuity offx=sgnx2-ax+1x2-ax+1=0 must have two distinct roots, for whichD=a2-4>0or a∈-∞,-2∪2,∞
ctaimg

ctaimg

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A function is defined as fx=limncos2nx,ifx<01+xnn,if0x111+xn,ifx>1which of the following does not hold good?

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