Find x if tan-1 4 + cot-1 x = pi / 2.

x = 1/4 because tan-1x + cot-1x = pi/2 for all values of x belong to R

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tan^-1(1/4)+cot^-1(x)=π/2
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I hope it works

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Easy method...✌

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Doubts are sold out

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