1
y`=[(2x+2)(3-4x)+4(x²+2x)]/(3-4x)²=(6x-8x²+6-8x+4x²+8x)/(3-4x)²=
=(-4x²+6x+6)/(3-4x)²
2
(3sinx-5xcosx)`=3cosx-5cosx+5xsinx=-2cosx+5xsinx
3
y`=e^x-6x
4
y`=[x²/x-2xlnx)/x^4=(x-2xlnx)/x^4=x(1-2lnx)/x^4=(1-2lnx)x³
5
y`=s^x*cosx-e^x*sinx-e^x*sinx-e^x*cosx=-2e^x*sinx