- Do cholesteric liquid crystals change colors due to the changing polarization of light when heated?

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How do you not get a mathematical function mixed up with multiplying? X2+y2−14x+14y+89=0 is the equation of a circle. What is the radius of the circle? A chemical reaction which requires energy to proceed is called ..? Find y' if y= -13/sqrt(x)? How can a hairdryer of 1875 watts work on a 120 volt 15 amp circuit?dpes this have a built in transformer?