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If int (1)/(sqrt(x^(2) + x+ 1)) dx = a ...

If `int (1)/(sqrt(x^(2) + x+ 1)) ` dx = a `sinh^(-1)` (bx + c ) + d then descending order of a, b,c is

A

a, b, c

B

b, c,a

C

b, a,c

D

c, a, b

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The correct Answer is:
C
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AAKASH SERIES-INDEFINITE INTEGRALS -EXERCISE -II
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  15. If int log (a^(2)+x^(2))dx=h(x)+c, then h(x)=

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  19. int (6x^(2) - 17 x - 5)/((x - 3)(x - 2)^(2)) dx =

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