#f(x)=sqrt(e^(2x)−x^2)/(x−1)^2;quadquadquadquada=3#
#y=f(a)-1/(f'(a))(x-a)#
#f(3)=sqrt(e^(6)−9)/4#
#f'(x)=(1/2(e^(2x)−x^2)^(-1/2)*(2e^(2x)-2x)(x-1)^2-sqrt(e^(2x)−x^2)(2(x-1)))/(x−1)^4#
#f'(x)=(1/2(e^(2x)−x^2)^(-1/2)*(2e^(2x)-2x)(x-1)-2sqrt(e^(2x)−x^2))/(x−1)^3#
#f'(3)=((e^6−9)^(-1/2)*(2e^6-6)-2sqrt(e^6−9))/8~~0.0755#
#y=sqrt(e^(6)−9)/4-(8(x-3))/((e^6−9)^(-1/2)*(2e^6-6)-2sqrt(e^6−9))#
#y=-13.24015x+44.6855#