While the limit definition is foundational, we rarely use it for complex functions. Instead, we rely on differentiation rules. a. Basic Rules | Rule | Formula | Example | |------|---------|---------| | Constant | ( \fracddx[c] = 0 ) | ( \fracddx[5] = 0 ) | | Power Rule | ( \fracddx[x^n] = n x^n-1 ) | ( \fracddx[x^4] = 4x^3 ) | | Constant Multiple | ( \fracddx[c \cdot f(x)] = c \cdot f'(x) ) | ( \fracddx[3x^2] = 6x ) | | Sum/Difference | ( (f \pm g)' = f' \pm g' ) | ( \fracddx[x^3 + x] = 3x^2 + 1 ) | b. Product Rule When two differentiable functions are multiplied:
Take ( \ln ) of both sides, use log properties to simplify, differentiate implicitly, solve for ( y' ).
[ \fracdydx = f'(g(x)) \cdot g'(x) ]
While the limit definition is foundational, we rarely use it for complex functions. Instead, we rely on differentiation rules. a. Basic Rules | Rule | Formula | Example | |------|---------|---------| | Constant | ( \fracddx[c] = 0 ) | ( \fracddx[5] = 0 ) | | Power Rule | ( \fracddx[x^n] = n x^n-1 ) | ( \fracddx[x^4] = 4x^3 ) | | Constant Multiple | ( \fracddx[c \cdot f(x)] = c \cdot f'(x) ) | ( \fracddx[3x^2] = 6x ) | | Sum/Difference | ( (f \pm g)' = f' \pm g' ) | ( \fracddx[x^3 + x] = 3x^2 + 1 ) | b. Product Rule When two differentiable functions are multiplied:
Take ( \ln ) of both sides, use log properties to simplify, differentiate implicitly, solve for ( y' ).
[ \fracdydx = f'(g(x)) \cdot g'(x) ]
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