- Prove csc(-x)-sin(-x)=-cosxcotx?

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IMPOSSIBLE math problems? The temperature is? If antibiotic susceptibility testing result of Staphylococcus aureus showed no bacterial growth, does that mean the antibiotic works or not? Determine the genotypes for each parrot parent? Find the volume of the solid formed by revolving the region bounded by the graphs of y= 2x^2+4x and y=0 about the y-axis?