If p=q is irrational, prove that the function f .t / D cos
Chapter , Problem 20(choose chapter or problem)
If p=q is irrational, prove that the function f .t / D cos pt C cos qt is not a periodic function. Suggestion: Show that the assumption f .t C L/ D f .t / would (upon substituting t D 0) imply that p=q is rational.
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