Prove that tan-¹ (x+3) + tan-¹(x-3) = tan-¹ 4/39
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.. =(2−1)={−1.21−2}=21−2
..=2{−1+−13} . =2{−1.+31−.3}=2(1+2)(1−2)(1+2)=21−2
..= ..
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