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Verified answer
Aplikasi InTegraLMenghitung Luas DaeRah
Luas = ∫x² dx [4...1]
L = 1/3 x³
L = 1/3 (4³ - 1³)
L = 1/3 (64 - 1)
L = 1/3 . 63
L = 21 satuan luas