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Expression : $$cotA+\frac{1}{cotA}=2$$
Squaring both sides, we get :
=> $$cot^2 A + \frac{1}{cot^2 A} + 2.cot A.\frac{1}{cot A} = 4$$
=> $$cot^2 A + \frac{1}{cot^2 A} = 4 - 2 = 2$$
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