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Arc length of polar curves

Problem

Which of the following integrals gives the arc length of the part of the three-petal flower space, r, equals, 2, cosine, left parenthesis, 3, theta, right parenthesis, space pictured above that lies in space, start color #df0030, start text, Q, u, a, d, r, a, n, t, space, I, end text, end color #df0030?
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