x + 1/x = 2 হলে x/(x² + x - 1) এর মান কত?

দেওয়া আছে
x + 1/x = 2
(x² + 1)/x = 2
x² + 1 = 2x
x² - 2x + 1 = 0
(x - 1)² = 0
x - 1 = 0
x = 1

এখন,
x/(x² + x - 1) = 1/1² + 1 - 1 = 1/1 = 1