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प्रश्न
Use the direct method to evaluate :
(0.5−2a) (0.5+2a)
बेरीज
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उत्तर
Note: (a+b) (a−b) = a2 − b2
(0.5−2a) (0.5+2a)
= (0.5)2 − (2a)2
= 0.25 − 4a2
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