Integrate the trig identity 2 cos j x cos kx = cos(j + k)x + cos(j - k)x to show that
Chapter 8, Problem 1(choose chapter or problem)
Integrate the trig identity 2 cos j x cos kx = cos(j + k)x + cos(j - k)x to show that cos jx is orthogonal to cos kx, provided j i- k. What is the result when j = k?
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