y=cos-1( (1+x2)1/2/2(1+x2)1/2 +1/2(1+x2)1/2 )1/2 find dy/dx
y=cos-1( (1+x2)1/2/2(1+x2)1/2 +1/2(1+x2)1/2 )1/2 find dy/dx

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