Evaluate:
(0.5 - 2a) (0.5 + 2a)
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Using the formula
[∵ (x + y)(x - y) = x2 - y2]
= (0.5)2 - (2a)2
= 0.25 - 4a2
Hence, (0.5 - 2a) (0.5 + 2a) = 0.25 - 4a2
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(a + b) (a - b) (a2 + b2)