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(-c*(cos(x))/sqrt(sin(x)))'*(1/sqrt(sin(x)))-(-c*(cos(x))/sqrt(sin(x)))*(1/sqrt(sin(x)))'
(-c*(cos(x))/sqrt(sin(x)))'*(1/sqrt(sin(x)))-(-c*(cos(x))/sqrt(sin(x)))*(1/sqrt(sin(x)))'
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