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Explain why tan pi=0 does not imply that arctan0=pi? Hi, I'm trying to simplify xy/((x^-2) + (y^-2)) I've tried multiplying the numerator and the denominator by several things but to no avail? Finding the equation to transform a matrix? If in the equation x/y - y/x is equal to 4, then how much does the equation x^2/y^2 - y^2/x^2 equal to? please help.? If 5 is increased to 9, the increase is what percent of the original number?

Answer #1| 14/01 2014 09:4466.666666666667 %