(4u^2+3)*(3u-5)*u^3=(12u^3+9u-20u^2-15)*u^3=12u^6+9u^4-20u^5-15u^3=
=12u^6-20u^5+9u^4-15u^3
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(4u^2+3)*(3u-5)*u^3=(12u^3+9u-20u^2-15)*u^3=12u^6+9u^4-20u^5-15u^3=
=12u^6-20u^5+9u^4-15u^3