If \( 2 x^{3}-5 x^{2}+x+2=(x-2)\left(a x^{2}-b x-1\right) \), then a & \( b \) are respectively
If \( 2 x^{3}-5 x^{2}+x+2=(x-2)\left(a x^{2}-b x-1\right) \), then a & \( b \) are respectively
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