820
1)f`(x)=6/2√(6x+7)=3/√(6x+7)
f`(10/3)=3/√27=3/3√3=1/√3
f`(x0)=tga=1/√3⇒a=π/6
2)f`(x)=-2/2√(5-2x)=-1/√(5-2x)
f`(2)=-1
f`(x0)=tga=-1⇒a=π-π/4=3π/4
821
1)f`(x)=-√3/3*sin(x/3)
f`(3π/2)=-√3/3*sinπ/2=-√3/3*1=-√3/3
f`(x0)=tga=-√3/3⇒a=π-π/6=5π/6
2)f`(x)=1/2*2cos2x=cos2x
f`(π/2)=cosπ=-1
f`(x0)=tga==-1⇒a=π-π/4=3π/4
822
1)f`(x)=-2/3cos²x +1/3*cosx/3
f`(3π)=-2/3cos²3π +1/3*cosπ=-2/3-1/3=-1
f`(x0)=tga=-1⇒a=π-π/4=3π/4
2)f`(x)=-sinx-√3/4sin²(x/2)
f`(π/3)=-sinπ/3-√3/4sin²(π/6)=-√3/2-√3/2=-√3
f`(x0)=tga=-√3⇒a=π-π/3=2π/3