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Question

Find the square root of
1+a2+(1+a2+a4)12

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Solution

It can be written as 1+a2+(1+a2+a4)12
=1+a2+1+a2+a4
=1+a2+1+a4+2a2a2
=1+a2+(1+a2)2(a)2
=1+a2+21+a2a2×1+a2+a2
=1+a+a22+1+a2a2+21+a2a2×1+a2+a2
=(1+a+a22+1+a2a2)2
Hence square root of 1+a2+(1+a2+a4)12 is 1+a+a22+1+a2a2.

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