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What is the color of potassium chromate solution? Does pink fiberglass contain silica? In a triangle ABC , a = 90 degree and D is the midpoint of AC . The value of BC square - ND square is equal to ? A curve has a slope of 4x+2 at (x,y) at the point (1,3). What is its equation? Thanks in advance? What is the oclack of dubi in compare of iran?