- How is e=mc2 use?

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Is (-x^y) always negative? And what about (-x^-y)? ***URGENT****PROVE THE IDENTITY
sin(theta)/1-cos(theta)=cot(theta) + csc(theta) *I keep getting cos(theta)+1/sin(theta) instead of minus -1? Calculate the number of moles of magnesium, chlorine, and oxygen atoms in 5.10 moles of magnesium perchlorate, Mg(ClO4)2.? Is 290 ng of meth a lot? What is photoelectric effect?