tan-1x+α-tan-1x=π4
⇒tan-1x+α-x1+x+αx=π4
⇒α1+xx+α=tanπ4
⇒α1+xx+αx=1
⇒1+xx+α=α
⇒1+x2+αx=α
⇒x2+αx+1-α=0
⇒x=-α±α2-41-α2
=-α±α2+4α-42
=-α±α+22-82
α সমান হলে, α+22-8=0
⇒ α+22=8
α+2=22
α=22-2=22-2
তবে সম্ভাব্য মান
x=-α+α2+4α-42
∵x>0 α>0
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