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[qquad [" Examples if "y=(log(cos x)sin ...

[qquad [" Examples if "y=(log_(cos x)sin x)(log_(sin x)cos x)+sin^(-1)(2x)/(1+x^(2))],[" then "(dy)/(dx)" at "x=(pi)/(2)" is equal to "],[[" (a) "(8)/(pi^(2)+4)," (b) "0," (c) "(-8)/(pi^(2)+4)," (d) "1],[" Ans.(c) "]]]

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