1.

Find the value of tan-1 ( ( frac{1}{3} ))+tan-1 ( ( frac{1}{5} ))+tan-1 ( frac{1}{7})[/latex]

A. tan<sup>-1</sup> u2061 (( frac{4}{7}) )
B. tan<sup>-1</sup> u2061 (( frac{9}{7}) )
C. tan<sup>-1</sup> u2061 (( frac{7}{9}) )
D. tan<sup>-1</sup> u20611
Answer» D. tan<sup>-1</sup> u20611


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