1. y=(2x⁶+3x⁴+1)⁴ y'=4*(2x⁶+3x⁴+1)³* (12x⁵+12x³)
2. y=(x²+2)⁴/x² y'=(u/v)'=1/v²[u'v-v'u
u=(x²+2)⁴ u'=4(x²+2)³*2x
v=x² v'=2x
y'=1/x⁴[4(x²+2)³*2x*x²-2x*(x²+2)⁴]
3. y=(x²-1)(x+3)⁴ y'=(uv)'=u'v+v'u
u=x²-1 u'=2x
v=(x+3)⁴ v'=4(x+3)³
y'=2x*(x+3)⁴+4(x+3)³*(x²+1)