1.

y=cos−1(1−x21+x2);0<x<1 x=tanθ y=cos−1(cos2θ)=2θ y=2tan−1x

Answer» y=cos1(1x21+x2);0<x<1
x=tanθ
y=cos1(cos2θ)=2θ
y=2tan1x


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