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[" 3.If "f(k)(x)=1/k(sin^(k)x+cos^(k)x),...

[" 3.If "f_(k)(x)=1/k(sin^(k)x+cos^(k)x)," where "x in R" and "k>=1],[" then "f_(4)(x)-f_(6)(x)" is equal to "],[[" (c) "y_(c)," (c) "y_(c)," (c) "y_(c)," (c) "y_(c)]]

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