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[" Let "f(k)(x)=(1)/(k)(sin^(k)x+cos^(k)...

[" Let "f_(k)(x)=(1)/(k)(sin^(k)x+cos^(k)x)quad " for "],[k=1,2,3,..." Then for all "x in R," the value of "],[f_(4)(x)-f_(6)(x)" is equal to : "]

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