Toán Lớp 12: Tính $\int_L |y| \, ds$, trong đó $L $ là đường Cardioid $r=a(1+\cos \varphi)(a>0)$
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Toán Lớp 12: Tính $\int_L |y| \, ds$, trong đó $L $ là đường Cardioid $r=a(1+\cos \varphi)(a>0)$
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