if y-1/y=4 so y^2+1/y^2 value must be
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Step-by-step explanation:
y+y1=9
Squaring both side
(y+y1)2=92
y2+y21+2×y×y1=81
y2+y21=81−2=79
Squaring
(y2+y21)2=(79)2
y4+y41+2×y2×y21=6241
y4+y41=6,239.
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