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Find tan x/2 for x in the first quadrant. use the half angle formula please. Need Help Please? What s a quick and easy way to convert between decimal and dozenal in my head? Rewrite the equation in Ax+By=C form. Use integers for A, B and C. y+2=-5(x+3)? How far away can a human voice; moving car; birds singing; airplane; be heard? If you are solving angle ABC, which angle are you looking for?