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                                    If cot−1(4+24)+cot−1(4+64)+cot−1(4+124)+.....∞=tan−1(ab), where a and b are relatively prime, then | 
                            
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Answer»  If cot−1(4+24)+cot−1(4+64)+cot−1(4+124)+.....∞=tan−1(ab), where a and b are relatively prime, then  | 
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