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Pilihan Topik Matematika - at ee-cafe.org

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2<br />

2<br />

∑ ( r k ∆θ)<br />

/ 2 = ∑( f ( θk<br />

))<br />

∆θ<br />

A αβ =<br />

/ 2<br />

Jika n menuju ∞, ∆θ menuju nol, kita dap<strong>at</strong> menuliskan luas bidang<br />

menjadi<br />

<strong>at</strong>au<br />

A<br />

αβ<br />

=<br />

∆θ→0<br />

β<br />

1<br />

=<br />

2<br />

lim<br />

∫<br />

α<br />

∑<br />

( r<br />

[ f ( θ)<br />

]<br />

2<br />

k<br />

2<br />

A<br />

∆θ) / 2 =<br />

dθ<br />

αβ<br />

2<br />

lim<br />

∆θ→0<br />

∫ β r<br />

= dθ<br />

α 2<br />

∑<br />

[ f ( θ)<br />

]<br />

2<br />

∆θ / 2<br />

(9.15)<br />

118 Sudary<strong>at</strong>no Sudirham, “<strong>Pilihan</strong> <strong>Topik</strong> <strong>M<strong>at</strong>em<strong>at</strong>ika</strong>”

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