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Find tan x/2 for x in the first quadrant. use the half angle formula please. Need Help Please? Does the earths albedo change? Vangelis said the albedo is 0.39 but i wonder if it still is? Identify the polynomial a^2b-cd^3 monomial, binomial, trinomial, four-term polynomial, OR five-term polynomial? What is (ln x-(3/2x))^2? 2.4 as a mixed number?