#40, p. 460

y[x_]:=3ArcCos[x/2]
y'[1]

l[x_]:=Pi-Sqrt[3](x-1)
Plot[{y[x],l[x]},{x,-.5,1.5}]

#64, p. 461

Integrate[Sin[x]/(1+Cos[x]^2),{x,0,Pi/2}]

#68, p. 461

Integrate[Exp[2x]/Sqrt[1-Exp[4x]],x]