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[" 3.Prove that the function "f(x)=cos x...

[" 3.Prove that the function "f(x)=cos x" is: "],[" (i) strictly decreasing in "(0,pi)" (ii) strictly increasing in "(pi,2 pi)" ."],[" (iii) neither increasing nor decreasing in "(0,2 pi)],[" 3! Show that "f(x)=x^(2)-x sin x" is an increasing function on "(0,pi/2)" ."]

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