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দৃশ্যকল্প-১: ( I= int_ 0 ^ pi / 2 frac dx 1+ cot x ); দৃশ্যকল্প-২: ( y^ 2 =4 ax ldots ldots(i) ) (i) এবং ( x^ 2 =4 a y ldots ldots )....... (ii) | Suva Ai