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Thursday, February 13, 2014

Derivative - Chain Rule, 6

Category: Differential Calculus, Algebra

"Published in Vacaville, California, USA"

Given the following functions:



Find dy/dx.

Solution:

The first thing that we need to do is to get the derivative of the given functions with respect to their independent variables. 

Take the derivative of the first equation with respect to u, we have
 







Take the derivative of the second equation with respect to u, we have  






Since there are three variables in the given functions, then we have to use the Chain Rule in getting dy/dx, we have  


Substitute the values of dy/du and dx/du to the above equation, we have

 


Since the two given equations have higher exponents and it's impossible to express each equations in terms of u, therefore

 

Wednesday, February 12, 2014

Derivative - Chain Rule, 5

Category: Differential Calculus, Algebra

"Published in Vacaville, California, USA"

Given the following functions:



Find dy/dx.

Solution:

The first thing that we need to do is to get the derivative of the given functions with respect to their independent variables. 

Take the derivative of the first equation with respect to u, we have
 





Take the derivative of the second equation with respect to u, we have  




Since there are three variables in the given functions, then we have to use the Chain Rule in getting dy/dx, we have 


Substitute the values of dy/du and dx/du to the above equation, we have 





Since the two given equations have higher exponents and it's impossible to express each equations in terms of u, therefore

 

Tuesday, February 11, 2014

Implicit Differentiation, 6

Category: Differential Calculus, Algebra

"Published in Vacaville, California, USA"

Find dy/dx by implicit differentiation for


Solution:

Consider the given equation above


Since the given equation is not a function, then we have to take the derivative of an equation with respect to y as follows









Therefore, by taking reciprocal on both sides of the equation,
 


We can also take the derivative of an equation by implicit differentiation as follows 










 
which is the same as the first method.