2tantheta-cot theta=1
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2tanA-cotA=1
2tanA-(1/tanA)=1
2tan²A-1=tanA
2tan²A-tanA-1=0
Let tanA=X
2X²-X-1=0
2X(X-1)+1(X+1) =0
(2X+1)(X+1)=0
tanX=-1/2 or -1
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