if y-1/y=4 find the value of y^2+1/y^2
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Answered by
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Step-by-step explanation:
Given y - 1/y = 4
(y - 1/y)² = y² - 1/y² - 2
(4)² = y² - 1/y² - 2
16 = y² - 1/y² - 2
y² - 1/y² = 18
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