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Question

Evaluate (a2b+2ba)2−(a2b−2ba)2−4

A
2
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B
ab
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C
a
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D
0
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Solution

The correct option is D 0
(a2b+2ba)2(a2b2ba)24
=(a2b+2ba+a2b2ba)(a2b+2baa2b+2ba)4
=(2a2b)(4ba)4
=44
=0

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