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Let coefficient of x^4 and x^2 in the ex...

Let coefficient of `x^4` and `x^2` in the expansion of `(x+sqrt(x^2-1))^6+(x-sqrt(x^2-1))^6` is `alpha` and `beta` then `alpha-beta` is equal to

A

`alpha - beta =-132`

B

`alpha + beta =60`

C

`alpha - beta =60`

D

`alpha+ beta =-30`

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The correct Answer is:
A
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