simplify the following
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let root be r.
r2/r6-r2 * r6+r2/r6+r2 = r2(r6+r2)/r6 square-r2 square
=r12+r4/4
r3/r6+r2*r6-r2/r6-r2 = r3(r6-r2)/r6square-r2square
=r18-r6/4
now,r12+r4-r18-r6/4
ans=r12+r4-r18-r6/4
r2/r6-r2 * r6+r2/r6+r2 = r2(r6+r2)/r6 square-r2 square
=r12+r4/4
r3/r6+r2*r6-r2/r6-r2 = r3(r6-r2)/r6square-r2square
=r18-r6/4
now,r12+r4-r18-r6/4
ans=r12+r4-r18-r6/4
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