គណិតថ្នាក់ទី12 អាំងតេក្រាល(ភាគ17)​ integral sin^(ax), sin^2 x, sin^2 (2x), sin^2 (3x) By Rachana Kim

គណិតថ្នាក់ទី12 អាំងតេក្រាល(ភាគ17)​ integral sin^(ax), sin^2 x, sin^2 (2x), sin^2 (3x) By Rachana Kim
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