simplify 2x⁴-x³+2x²-1+4x²+x³
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2x⁴-x³+2x²-1+4x²+ x³
=2x⁴+2x²+4x²-1 (-x³ and x³ gets cancelled)
= 2x⁴+6x²-1
=2x⁴+2x²+4x²-1 (-x³ and x³ gets cancelled)
= 2x⁴+6x²-1
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