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2/3=b/(2*2 + b*b)^(1/2) * cos t/sin t;b*sin t = -2/3 * (2*2 + b*b)^(1/2) * cos t - 3
2/3=b/(2*2 + b*b)^(1/2) * cos t/sin t;b*sin t = -2/3 * (2*2 + b*b)^(1/2) * cos t - 3
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