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Let f(x) = a_(1) cos (alpha_(1) + x) + a_(2) cos (alpha_(2) + x) +…+ a_(n) cos (alpha_(n) + x). If f(x) vanishes for x = 0 and x = x_(1) (where x_(1) ne k pi, k in Z) then |
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Answer» `a_(1) cos alpha_(1) + a_(2) cos alpha_(2) + …+ a_(n) cos alpha_(n) = 0` |
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