7.28 y'=(3*(2x+3)-(3x+2)*2)/(2x+3)^2=
=(6x+9-6x-4)/(2x+3)^2=5/(2x+3)^2
7.27
y'=2x*sinx+x^2cosx+2cosx-2xsinx-2cosx=
=x^2*cosx
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Verified answer
7.28 y'=(3*(2x+3)-(3x+2)*2)/(2x+3)^2=
=(6x+9-6x-4)/(2x+3)^2=5/(2x+3)^2
7.27
y'=2x*sinx+x^2cosx+2cosx-2xsinx-2cosx=
=x^2*cosx