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Let fk(x)=1k(sinkx+coskx) for k=1,2,3,…. Then for all x∈R, the value of f4(x)−f6(x) is equal to: |
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Answer» Let fk(x)=1k(sinkx+coskx) for k=1,2,3,…. Then for all x∈R, the value of f4(x)−f6(x) is equal to: |
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