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Let f(θ)=sin(tan−1(sinθ√cos2θ));−π4<θ<π4, Then the value of d(d(tanθ))(f(θ)) is

Answer» Let f(θ)=sin(tan1(sinθcos2θ));π4<θ<π4, Then the value of d(d(tanθ))(f(θ)) is


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