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Let f(x) =a_(1)cos(alpha_(1)+x)+a_2cos(alpha_2+x)+............+ a_ncos(a_n+x) . If f(x) vanishes for x = 0 andx=x_1 (where x_1 ne kpi, k in Z) then |
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Answer» `a_(1)cosalpha_(1)+a_(2)cos alpha_(2)+..........+a_(n)cos alpha_(n)=0` |
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