0(0)=cot-1(1)=π4; 0 (2)=cot-1(7)=tan-117; 0 (1)= cot-1(3)=tan-1=13
2(0 (1))=2 tan-113=tan-117+tan-134
L.H.S= 0 (2)+20 (1)=tan-117+tan-134
=tan-117+341-328=tan-1=π4=R.H.S (Showed)
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