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निम्नलिखित व्यंजकों के मान ज्ञात कीजिए ज...

निम्नलिखित व्यंजकों के मान ज्ञात कीजिए जब `x=-1` है
(i) `2x-7` (ii)`-x+2` (iii) `x^(2)+2x+1` (iv) `2x^(2)-x-2`

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