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[" 20.If "f(x)=(2-x cos x)/(2+x cos x)" ...

[" 20.If "f(x)=(2-x cos x)/(2+x cos x)" and "g(x)=log_(e)x,(x>0)" then "],[" the value of the integral "int_(-pi/4)^( pi/4)g(f(x))dx" is: "],[[" (1) "log_(e)1," (2) "log_(e)3],[" (3) "log_(e)2," (4) "log_(e)e]]

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