1.Упростите выражения :
а)(4х^2+3y)(y-2x^2)
b)(a^2-b^2)(2a+b)-ab(a-b)
c)(5x+2)(x^2-2x-3)
d)-3b(1-b^2)(5b+2)
2.Докажите тождество :
х^4-1=(x+1)(x^3-x^2+x-1)
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