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integrate (integrate 2sqrt(a-(p*cos(t))²-(p*sin(t))²)p dp from 0 to a*sin(t))dt from -pi/2 to pi/2
integrate (integrate 2sqrt(a-(p*cos(t))²-(p*sin(t))²)p dp from 0 to a*sin(t))dt from -pi/2 to pi/2
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