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Misalkan $D$ adalah daerah yang diberikan oleh persamaan $r=cos(4\\theta)$ seperti di bawah ini:

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Berapakah luas daerah $D$ tersebut?

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(Catatan: jika hasil yang diperoleh memuat konstanta  $\\pi$, maka tuliskan \"pi\". Misalkan hasilnya adalah $\\frac{\\pi}{17}$, maka tuliskan pi/17.)

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