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1. $4 x^{2} - 2$

Answer: Option A

Explanation:

4 x^{2} - 2 = {(2 x)}^{2} - 2.2 x . \frac{1}{2 x} + {(\frac{1}{2 x})}^{2} - (\frac{1}{2 x}) = {(2 x - \frac{1}{2 x})}^{2} - \frac{1}{4 x^{2}} যেহেতু + \frac{1}{2 x} লাগছে তাই \frac{1}{- 4 x^{2}} বিয়োগ করতে হবে

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