(1)
y'=(x+1)'(x+2)(x+3)+(x+1)(x+2)'(x+3)+(x+1)(x+2)(x+3)'
=(x+2)(x+3)+(x+1)(x+3)+(x+1)(x+2)
=3x²+12x+11
(2)
y'=(x²)'+(1/x)'+(-3/x^3)'
=4x-1/x²+9/(x^4)
(3)
y'=(e^x)'cosx+(e^x)(cosx)'+(sinx)'
=(e^x)cosx-(e^x)sinx+cosx
=(e^x)(cosx-sinx)+cosx
(1)
y'=(x+1)'(x+2)(x+3)+(x+1)(x+2)'(x+3)+(x+1)(x+2)(x+3)'
=(x+2)(x+3)+(x+1)(x+3)+(x+1)(x+2)
=3x²+12x+11
(2)
y'=(x²)'+(1/x)'+(-3/x^3)'
=4x-1/x²+9/(x^4)
(3)
y'=(e^x)'cosx+(e^x)(cosx)'+(sinx)'
=(e^x)cosx-(e^x)sinx+cosx
=(e^x)(cosx-sinx)+cosx