S. 90 : Double taxation relief-Long term capital gains-Tax residency certificate-Tax resident of Mauritius with valid TRC and a beneficial owner of income derived from sale of shares, is entitled to treaty benefits, and, thus, capital gain, being exempt under treaty provisions could not be brought to tax in India-DTAA-India-Mauritius [ S.9(1)(1), 45, art, 13(3A), 13(4)]