A primitive nth root of unity is a complex number a such that 1,a,a^2,....., a^(n-1) are distinct roots of unity. Show that if a, b are primitive nth and mth roots of unity, respectively, then ab is a kth root of unity for some integer k. What is the smallest value of k? What cn be said if a and b are nonprimitive roots of unity?
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?i don't get the question :) unity is 1 nd roots of real numbers r real

"A primitive nth root of unity is a COMPLEX number a............"

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