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If $$ {x+{1 over x}=7}$$ then $$ {x^{2}+{1 over {x...
1.
If $$ {x+{1 over x}=7}$$ then $$ {x^{2}+{1 over {x^{2}}}=?}$$
A.
47
B.
45
C.
49
D.
51
Answer» B. 45
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