Rút gọn các biểu thức sau:
a)(\(^{a^2}\)+a-1).(\(^{a^2}\)-a+1)
b)(a+2)(a-2).(\(^{a^2}\)+2a+4).(\(^{a^2}\)-2a+4)
c)\(^{\text{(2+3y)}^2}\)-\(^{\text{(2x-3y)}^2}\)-12xy
d) \(^{\left(x+1\right)^3}\)-\(^{\left(x-1\right)^3}\)-(\(^{x^3}-1\))-(x-1).(\(^{x^2+x+1}\))