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[" Q12.If "f(k)(x)=(1)/(k)(sin^(k)x+cos^...

[" Q12.If "f_(k)(x)=(1)/(k)(sin^(k)x+cos^(k)x),x in R,k>=1," then "f_(4)(x)-f_(6)(x)=],[[" (a) "(1)/(6)," (b) "(1)/(3)," (c) "(1)/(4)," (d) "(1)/(12)]]

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