\(x=\sqrt7+\sqrt6\) āĻšāϞ⧠\(x^2+\cfrac{1}{x^2}\) āĻāϰ āϏāϰāϞāϤāĻŽ āĻŽāĻžāύ āύāĻŋāϰā§āĻŖā§ āĻāϰāĻŋ āĨ¤
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\(âĩ x=â7+â6\)
\(â´ \cfrac{1}{x}=\cfrac{1}{â7+â6}\)
\(=\cfrac{(â7-â6)}{(â7+â6)(â7-â6)}\)
\(=\cfrac{â7-â6}{7-6}\)
\(=â7-â6\)
\(â´ x+\cfrac{1}{x}=(â7+â6)+(â7-â6)\)
\(=â7+â6+â7-â6\)
\(=2â7\)
\(x^2+\cfrac{1}{x^2}\)
\(=\left(x+\cfrac{1}{x}\right)^2-2.x.\cfrac{1}{x}\)
\(=(2â7)^2-2\)
\(=28-2\)
\(=26\) [Answer]
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