1 / A-3 minus 1 / a square-9 minus A-1 / 6 + 2A

1/(a-3)-1/(a^2-9)-1/(6+2a)
=【(a+3)-1-(a-3)/2】/（a^2-9）
=(a-5)/[2*(a+3)(a-3)]

RELATED INFORMATIONS

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