(1)y=cos^2√xy'=2cos√x*(cos√x)'=2cos√x*(-sin√x)*(√x)' =2cos√x*(-sin√x)*(1/2)*1/√x =-sin(2√x)(1/2)*1/√x =-sin(2√x)/(2√x)(2)y=ln sin2xy'=1/(sin2x)*(sin2x)' =1/(sin2x)*(cos2x)*(2x)' =1/...