DIFFERENTIATION OF RAISE TO POWER FUNCTION


Derivative of lnx, derivative of log x2, derivative of ey,derivative of 2ˣ, Differentiation of raise to power function an easy and short cut manners, differentiation of raise to power function.

Till Date we have learn to differentiate this question by taking log on both sides and then differentiate.


DIFFERENTIATION OF   VARIABLE POWER  FUNCTIONS


                 

 This is very long process to differentiate this types of functions .

But today we shall learn a different and an easiest method to differentiate such type of functions.
DIFFERENTIATION OF   VARIABLE POWER  FUNCTIONS       
then assume this function as [ log (Base) ]× [ Power ] then use product rule of differentiation and place the given function in front of the result so obtained.

DIFFERENTIATION OF   VARIABLE POWER  FUNCTION

       

Question  Differentiate f(x) = (cos x )sin x


Reduce this problem to product of two function ,1st function will be log of base of given problem and 2nd function will be power of given problem such that 

∴ h(x) = (log cos x) ×(sin x)
then it derivative will be 

 f '(x) = h'(x)

⇒ f '(x) = f(x) [(log cos x) .  (sin x) + sin x  (log cos x)]

Therefore  f '(x) = f(x) [(log cos x) . cos x + sin x (- sin x ) /cos x)]

Therefore  f '(x) = (cos x )sin x [(log cos x) . cos x - sin x .tan x]

Question : How to solve this f(x) = x sin x  




First Assume base x as Log x as 1st function and power function as 2nd function, then apply Product rule of differentiation, and place f(x) in front of the result so obtained.
{ log x . sin x }= ( log x)( sin x ) + ( sin x )( log x)

= log x . cos x + sin x . (1/x)
                            

                     
Now put f(x) in front of this result and that will be derivative of the f(x).
Hence f ' (x) = sin x { log x . cos x + sin x . (1/x) }

Question : Differentiate w.r.t. 'x'

 f(x) = cos x sin x + (sin x) x 

Let  f(x) = g(x) + h(x)
Then   f '(x) =g'(x) + h'(x)
Just place cos x sin x  in front of derivative of {(log cos x) . (sin x) } + place  (sin x) x  in front of derivative of { ( log sin x) . ( x) },

So Answer will be



DIFFERENTIATION OF   VARIABLE POWER  FUNCTION

                     


Similarly derivative of h(x) = (sin x) x    in one step can also be written as
h '(x) = (sin x) x [ log sin x × 1+ x . cos x/sin x ]

DIFFERENTIATION  USING PRODUCT RULE




Question : Differentiate f (x) = sin x 

 then using short cut method , 


f '(x) = sin x  [ log e . {sin x} + sin x {log  e}]

f '(x) = sin x  [ log e × cos x ] ,

f '(x) = cos x .sin x   

Because derivative of log e is zero and log e is equal to one


Question : Differentiate f (x) = sin x 


If f (x) = a sin x 
then using short cut method , 

f '(x) =sin x [ log a . {sin x} + sin x {log  a}]

f '(x) = a sin x [ log a . cos x ] ,

Because derivative of log a is zero 


DIFFERENTIATION OF   VARIABLE POWER  FUNCTION
















Question : Differentiate f (x) = x sin x + cos x 

If f (x) = x sin x + cos x 

then using short cut method , 

f '(x) = x sin x + cos x [ log x .{sin x + cos x } + {sin x + cos x }{log x}]

f '(x) = x sin x + cos x log x  . {cos x - sin x} + {sin x+cos x }.{1/x} ] 


One more shortcut for differentiation you can use

DIFFERENTIATION OF   VARIABLE POWER  FUNCTION USING PRODUCT RULE

            






Conclusion


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