1) y = 2x^4*e^x
y' = 8x^3*e^x+2x^4 * e^x
2) y = 2cos4x
y' = -8sin4x
y'(p/8)=-8sin(4*p/8)=-8sin(p/2)=-8
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1) y = 2x^4*e^x
y' = 8x^3*e^x+2x^4 * e^x
2) y = 2cos4x
y' = -8sin4x
y'(p/8)=-8sin(4*p/8)=-8sin(p/2)=-8