- How would you simplify 2tan15°/(1-tan^2 15°)?

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F(x)=((x+3)/(x-1)), evaluate (f(x)-f(1))/(x-1)? If you fail the Algebra 1 EOC retake what will happen? Find the sum of cos^2 x + cos^2 (x+1°) + cos^2 (x+2°) + ... + cos^2 (x+179°).? What is y^4 minus y^3 plus 2y^2 +y minus1 divided by y^3 + 1? What is the typical makeup of the solids contained in Returned Activated Sludge in a sewage plant? Percentages would be ideal thanks.?