Report copyright - 2. 3. 4. 5. - ยินดีต้อนรับ ...e-book.ram.edu/e-book/p/PH240(30)/ph240(30)-2.pdf · 76 = !Ix2 dxdy. A lll~n’nl i9GJ x =r co.33 ) y =r sine dxdy = rdrde, 2n
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