Q.

The value of limx→1α sin⁡cx2+bx+axα−1 (where α and β are the roots ax2+bx+c=0) is

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a

cβ−ααβ

b

β−αα

c

d

cα1α−1β

answer is D.

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Detailed Solution

∵ Roots of ax2+bx+c=0 are α and βso roots of cx2+bx+a=0 are 1α and 1β∴ cx2+bx+a=cx−1αx−1β Now, limx→1α sin⁡cx−1αx−1βαcx−1αx−1β⋅cx−1β          =cαlimx→1α sin⁡cx−1αx−1βcx−1αx−1β⋅limx→1α x−1β=cα1α−1β
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The value of limx→1α sin⁡cx2+bx+axα−1 (where α and β are the roots ax2+bx+c=0) is