2 tan inverse1/2+ tan inverse1/7 = tan inverse31/17
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= tan inverse [2×1/2/1-1/4] + tan inverse [1/7]
= tan inverse [ 4/3] + tan inverse [1/7]
= tan inverse {4/3 + 1/7/1- 4/3×1/7}
= tan inverse { 31/21 × 21/ 17}
= tan inverse { 31/ 17}
I hope it helps you.
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