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Question

Ifα is two solution of equation tan1x+cot1x=2tan1x,thenα2 is equal to

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Solution

tan1x+cot1x=2tan1x

tan1x+tan11x=2tan1xtan1⎜ ⎜ ⎜x+1x1x1x⎟ ⎟ ⎟=2tan1x

2tan1x=π2

tan1x=π4

x=1

α=1

α2=1

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