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[" 1.Let "f(x)(x)=(1)/(k)(sin^(2)x+cos^(...

[" 1.Let "f_(x)(x)=(1)/(k)(sin^(2)x+cos^(2)x)" where "x in R" and "k>=1" .then "f_(4)(x)-f_(6)(x)" -f_6 ( x ) "" equals "],[[" (a) "1/6," (b) "1/3," (c) "1/4," (d) "1/12]]

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