find y²+1/y²y and y4+1/y4 of y-1/y =9
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y-1/y=9
Squaring on both sides;
(y-1/y)^2=(9)^2
y^2-2XyX1/y+(1/y)^2=81
y^2-2+1/y^2=81
y^2+1/y^2=81+2
y^2+1/y^2=83
Squaring on both the sides, we get;
(y^2+1/y^2)^2= (83)^2
(y^2)^2+2Xy^2X1/y^2+(1/y^2)^2=6889
y^4+2+1/y^4=6889
y^4+1/y^4=6889-2
y^4+1/y^4=6887
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