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integral [sqrt(1-v^2)-sqrt(1-(v-4.33e-6v/sqrt(1-v^2))^2)]/0.866e-6dv;for v=0..0.866
integral [sqrt(1-v^2)-sqrt(1-(v-4.33e-6v/sqrt(1-v^2))^2)]/0.866e-6dv;for v=0..0.866
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