2(5-у^2)(y^2+5)+(y^2-3)^3-(y^2+y-1)(4-y^2)
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$2(5-y^2) (y^2+5) + (y^2 - 3)^2 - (y^2 + y - 1) (4- y^2) =$ $= (10 - 2y^2)(y^2 + 5) + y^4 -$ $6y^2 + 9 - 4y^2 - 4y + 4 + y^4 + y^3 - y^2 =$ $= 10y^2 + 50 - 2y^4 - 10y^2 + y^4$ $- 6y^2 + 9 - 4y^2 - 4y + 4 + y^4 + y^3 - y^2 =$ $50 - 6y^2 + 9 - 4y^2 - 4y + 4 + y^3 - y^2 =$ $y^3 - 11y^2 - 4y + 63$