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put tan = X we get
X +1/X = 2
x^2 + 1 = 2x
x^2 -2x +1 = 0
(x-1) ^2 = 0
X = 1
so tan = 1
tan ^2 + 1/ tan ^ 2 = 1 + 1 = 2
X +1/X = 2
x^2 + 1 = 2x
x^2 -2x +1 = 0
(x-1) ^2 = 0
X = 1
so tan = 1
tan ^2 + 1/ tan ^ 2 = 1 + 1 = 2
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