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70. If cosx+cos7x+cos3x+cos5x=0 then x= (A)n(pi)/4,n=Z (B)n(pi)/2,n=I (C)n(pi)/8;n+8k,n,z=Z (D)n(pi)/3;n=Z

Answer» 70. If cosx+cos7x+cos3x+cos5x=0 then x= (A)n(pi)/4,n=Z (B)n(pi)/2,n=I (C)n(pi)/8;n+8k,n,z=Z (D)n(pi)/3;n=Z


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