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[" If: "f(x)=cos x-cos^(2)x+cos^(3)x-......

[" If: "f(x)=cos x-cos^(2)x+cos^(3)x-..." to "oo,x!=0],[" then: "int f(x)dx=a=cos x" ce."],[[" then : "," fos "x" is "x," sum of "x=-cos x]]

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