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Differentiate between Spectral line and slit widths? Does vikane burn eyes? Would pitch black solar panels be Extremly efficient for electricity production? Does pseudoephedrine or other medicine have permanent effect? Suppose a,b, and c form an arithmetic sequence. Prove that b^2+bc+c^2, c^2+ca+a^2, a^2+ab+b^2 also form an arithmetic sequence.?