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Q.

If Ltx0x-3 sin 3x+ax-2+b exists and is equal to 0, then

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a

a=-3 and b=-92

b

a=3 and b=-92

c

a=3 and b=92

d

a=-3 and b=92

answer is A.

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Detailed Solution

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Ltx0sin 3xx3+ax2+b=Ltx0sin 3x+ax+bx3x3

Ltx0sin 3x3x.3+a+bx2x2exists finitely 3+a=0  a=-3

Now Ltx0sin 3x-3x+bx3x3put 3x=tx=t3x3=t327

27.27Ltx0sint-tt3+b=0 27Ltx0cost-13t2+b=0=-276+b=0(L.H.R)b=92

a=-3,b=92

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