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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

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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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Correct Answer - A
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