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plot(y%3Dx%2Cy1%3Dx%5E2%2Cr%3Dcos(theta)%2Cr1%3Dsin(theta))
plot(y%3Dx%2Cy1%3Dx%5E2%2Cr%3Dcos(theta)%2Cr1%3Dsin(theta))
unsupported operand type(s) for *: 'Mod' and 'ClassRegistry'
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