xn nx
1 Notations derivative f x derivative derivative
dya question
whenyoudifferentiateacertainequation thedifferentiatedequation ie becomestheformulaof
dye
atgradient
ChainRule d
eg derivativeof 3 2
x
0 3 2 u
a
3
tt
y
Ify f x isgraphofafunctionthen functionofthiscurve
dya fix isgradient
atpointA x wheretangent normalmeet is m thenequation tangentis given
of
Ifvalueof1 g by
y y m x X Thenormalatpoint x y isperpendiculartotangentsogradientofnormalis_em
ofnormalis
equation
yy Ym X x
1 FirstDerivativeofywithrespectto x
secondderivativeofywithrespecttox
112
48FurtherDifferentiation
DecreasingFunction f x valuesdecreasewhenever valuesincrease ygix
IncreasingFunction f x valuesincreasewhenever valuesincrease
whenf x o f x incr
fn x isincreasing aigy so for x a
whent x co f x
ifh x isdecreasingxcai.gg co taxca decreas
StationaryTurningPointApointwheregradientiszero
pointdYdx
MaximumPoint Gradientispositivetotheleft maxpoint negativetoright atmax
of
MinimumPoint Gradientisnegativetoits
left positivetotheright atminpointdydx o Wt