if (x-1/x)² = 36, find the value of x²+1/x²
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(x-1/x)² = 36
x²+1/x²-2× x × 1/x = 36
x²+1/x² -2 = 36
x² + 1/x² = 36 + 2
x²+1/x² = 38
Above this formula used
( a-b)²=a²-b²-2ab)
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